2 1 UC SAN DIEGO PHYSICS From The Chair Spring 2013 Professor Dimitri N. Basov Special Recognition: Sally Ride 2 Department News 3 Dear Alumni and Friends of the UC San Diego Department of Physics, This newsletter describes a number of notable events from the past year, including scientific breakthroughs, new appointments and awards. It was a very good year. Research carried out by our students, postdoctoral fellows and faculty is thriving. The discovery of the Higgs Boson, in which UCSD physicists played a critical role, is arguably the most important science achievement of this century. For the first time in more than a decade, the Department may start growing again. Itʼs a fortuitous development, a product of a forward-looking hiring plan that we devised in 2011 despite a dire fiscal climate on the campus. We hired three rising stars this year. Eva-Maria Collins (joint appointment with Biology) came from Princeton; Suckjoon Jun previously held a junior fellow appointment at Harvard; and John McGreevy moved to San Diego from MIT. We are in the process of making additional offers that will strengthen our current efforts in condensed matter physics, biophysics and astrophysics. We are contemplating an expansion in an area that is new for our Department: atomic, molecular and optical physics. The newly established Center for the Advanced Nanoscience is moving full steam ahead with flagship efforts in superconductivity and new materials. We have just learned that the number of physics majors in the incoming freshman class has nearly tripled since 2011 and has reached 99. Our undergraduate program, already one of the largest in the nation, is clearly attracting even more young people. Things are looking good and the outlook for the next year is even better! Changes. The Department has carried out a thorough self-study as a part of the Strategic Planning Initiative of our new Chancellor: Pradeep Khosla. The Department has produced a 10-year vision document in which we detailed a series of concrete and bold actions aimed to enhance every aspect of our academic enterprise. The highlights of our long-term vision include new research centers and a new physics major with a specialization in quantitative biology. We are facing many challenges, including extreme understaffing, a product of recent budget cuts. In 2013-14, we intend to complete an aggressive hiring plan that the Department proposed two years ago. Jointly with Biology and Chemistry, we are on course toward establishing a major effort in quantitative biology. In partnership with the Jacobs School of Engineering, we are finalizing the details of the plan for yet another hiring initiative in the area of advanced energy. These efforts will ensure an expanded role for UC San Diego Physics in global intellectual leadership in the 21st century. As we move forward, we invite you – our esteemed alumni and friends – to become active participants in the life of the Department. Please drop me a line (dbasov@ucsd.edu) to share your thoughts and successes, take 20 seconds to subscribe to our Newsletter (http://physics.ucsd.edu/news/newsletter/), or browse our website for the latest updates and announcements of Physics events [http://physics.ucsd.edu/]. You may be interested to attend our weekly colloquia, held on Thursdays at 4 pm, where we ask renowned leaders in their areas of research to give an overview of the latest exciting developments, or to attend one of our annual public lectures. We look forward to hearing from you and to your participation in the UC San Diego physics community in the years to come. • • Appointments & Tenure Awards Faculty Spotlight: Vivek Sharma 6 UCSD Physics: Funded! 10 Three Generations in Physics 11 Milestones: Harry Suhl 12 Physics in the News 16 Giving Opportunities 17 • • • Connecting with UCSD Physics Thank you for your support! Donation Form This newsletter was produced by Science Writer Bruce Lieberman. Special Recognition: Dr. Sally Ride This spring, President Barack Obama announced that he would award a posthumous Presidential Medal of Freedom to Dr. Sally Ride, the first American female astronaut to travel to space and a former Professor of Physics at UCSD. The Medal of Freedom is the Nation's highest civilian honor, presented to individuals who have made especially meritorious contributions to the security or national interests of the United States, to world peace, or to cultural or other significant public or private endeavors. “We remember Sally Ride not just as a national hero, but as a role model to generations of young women,” President Obama said. “Sally inspired us to reach for the stars, and she advocated for a greater focus on the science, technology, engineering and Credit: NASA math that would help us get there. Sally showed us that there are no limits to what we can achieve, and I look forward to welcoming her family to the White House as we celebrate her life and legacy.” Americans were first introduced to Dr. Sally Ride when she traveled on the Space Shuttle in 1983. After leaving NASA in 1987, she focused her efforts on science education and on teaching girls in particular that there are no limits to what they can accomplish. Dr. Ride founded Sally Ride Science in 2001 to develop and provide classroom materials, programs, and professional development opportunities for K-12 science, technology, engineering, and math (STEM) educators. She placed a strong emphasis on gender and racial equality in the classroom and on introducing students to working scientists, engineers and mathematicians who exemplified this diversity in their respective fields. Dr. Ride was one of the architects and drivers of the Administration's Credit: NASA ongoing efforts to maximize participation of underrepresented groups in STEM classes and careers. And her devotion to the exploration of space never wavered, as multiple Administrations, including President Obama's, called on Dr. Ride to serve on advisory boards focused on national space exploration efforts. Dr. Ride, who passed away last year after a battle with cancer, has been bestowed posthumously with other honors. The place where NASAʼs twin Grail spacecraft ended their missions with a well-orchestrated crash into the moon has been named after her. Dr. Ride was in charge of the Grail missionʼs MoonKam project, which allowed students from around the world select targets on the moon to image. Separately, the U.S. Navy announced in April that an ocean-class auxiliary general oceanographic research (AGOR) vessel would be named R/V Sally Ride. Secretary of the Navy Ray Mabus named the vessel, which will be a Neil Armstrong-class AGOR ship. Credit: US Navy 2 Department News Appointments & Tenure Awards The following members have been promoted to new faculty positions. The Department congratulates them on this milestone and wishes them continued success. Five faculty members of the Physics Department were named 2012 Fellows of the American Association for the Advancement of Science. They are: Oleg Shpyrko has been promoted to Associate Professor with tenure. Olegʼs condensed matter group studies nanoscale dynamics and the structure of materials. He is interested in developing novel coherent x-ray scattering techniques to probe the dynamics in a variety of condensed matter systems. Suckjoon Jun has been hired as an Assistant Professor. Suckjoon is interested in several questions related to biology, including the driving force underlying chromosome segregation in bacteria, the relationship between growth and the cell cycle, and the origin of cell shape plasticity. Eva-Maria S. Collins has been hired as an Assistant Professor. Her research interests include the role of physical principles for living systems. Currently, she works in three major areas: biomechanics, asexual reproduction, and behavior & memory. Eva-Maria has been selected as an Alfred P. Sloan Research Fellow. The award nominates the very best young scientists from the U.S. and Canada. John McGreevy has been hired as an Assistant Professor. He is currently interested in finding physical applications of string theory. John and collaborators have made progress toward describing a number of systems that have proven difficult for standard techniques, including cold fermionic atoms at unitarity, and non-Fermi liquid metals. Professor Dimitri Basov, chair of the Department, was cited for “distinguished contributions to spectroscopic studies of new materials.” Dimitriʼs group uses infrared light to probe the electronic and magnetic properties of novel materials such as superconductors, spintronic devices and graphene. He is a fellow of the American Physical Society and was awarded the organizationʼs Frank Isakson Prize for Optical Effects in Solids in 2012. Professor Benjamin Grinstein is a theorist who studies the decay of heavy quarks to discover fundamental principles that govern the basic building blocks of nature and their interactions. A member of the High Energy Theory Group, Ben was recognized “for distinguished contributions to the field of particle physics, leading to accurate tests of theory and the precise determination of fundamental constants of nature.” He recently developed a test for string theory based on how particles called W bosons scatter in high-energy collisions, like those being carried out at the Large Hadron Collider. Professor Aneesh Manohar was cited “for distinguished contributions to the field of elementary particle physics, particularly for the development of effective field theory methods and their application to quantum field theory.” Aneesh is a member of the international Particle Data Group, which publishes the biennial Review of Particle Physics outlining critical issues in physics that help to shape our understanding of the universe. Manohar is an author, with Mark Wise, of the book Heavy Quark Physics. 3 Professor David Kleinfeld is pursuing a broad range of questions about the brain, including how rodents wave their whiskers to assemble a stable representation of the physical world through touch and the fluid dynamics of blood as it flows through the brain or is blocked, as it can be in stroke. David was cited “for distinguished contributions in quantitative neuroscience, including active sensation of the vibrissa sensorimotor system, blood flow dynamics within cortical vasculature, and novel analysis and instrumentation.” Professor Arthur Wolfe studies the formation of galaxies, particularly the set of early events that gave rise to the rotating disks of stars and gas that we find in spiral galaxies today. Arthur was elected “for distinguished contributions to the fields of astronomy and cosmology, particularly for predicting anisotropies in the cosmic microwave background and discovering Damped Lyman Alpha Systems” – cold quiescent layers of neutral hydrogen gas that likely held the component of the early universe that became stars. *** Patrick Diamond has been awarded the 2012 Nuclear Fusion Award from the International Atomic Energy Agency. The Board of Editors voted his paper, Physics of Non-diffusive Turbulent Transport of Momentum and the Origins of Spontaneous Rotation in Tokamaks, as the most outstanding paper from the 2009 volume. The Nuclear Fusion prize is awarded annually to recognize outstanding work published in the journal. Each year, a shortlist of ten papers is nominated for the Nuclear Fusion prize. These are papers of the highest scientific standard, published in the journal volume from two years previous to the award year. Nominations are based on citation record and recommendation by the Board of Editors. The Board then votes by secret ballot to determine which of these papers has made the largest scientific impact. The award was presented at the 2012 Fusion Energy Conference in San Diego. George Fuller was selected to receive the 2013 Hans A. Bethe Prize. The prestigious award is given annually by the American Physical Society to “recognize outstanding work in theory, experiment or observation in the areas of astrophysics, nuclear physics, nuclear astrophysics, or closely related fields.” The prize, which was established to honor Bethe, a renowned nuclear physicist at Cornell University, consists of $10,000 and a certificate citing the contributions made by the recipient. George was cited for “outstanding contributions to nuclear astrophysics, especially his seminal work on weak interaction rates for stellar evolution and collapse and his pioneering research on neutrino flavor-mixing in supernovae.” He formally received his award at a special session of the society's April 2013 meeting in Denver. George has focused much of his recent research on the physics of the mysterious and ghostlike particles in the universe known as neutrinos, which hold the keys to physicists' improved understanding of cosmology, exploding stars called supernovae, and the origin of the elements. George and his research group at UC San Diego have been calculating how neutrinos likely changed their “flavors” in the early universe, how they do so now within supernovae, and how this process affects the synthesis of elements within stars - a process astrophysicists call nucleosynthesis. Massimiliano Di Ventra was elected APS Fellow “for contributions to the theory of electronic transport in nanoscale conductors” and was nominated by the Division of Condensed Matter Physics. The criterion for election is exceptional contributions to the physics enterprise, for example: outstanding physics research; important applications of physics; leadership in or service to physics; or significant contributions to physics education. The Fellowship is a distinct honor that signifies recognition by one's professional peers. Each nomination is evaluated by the Fellowship committee of the appropriate APS division, topical group or forum, or by the APS General Fellowship committee. After review by the full APS Fellowship Committee, the successful candidates are elected by the APS Council. 4 Suckjoon Jun, an assistant professor of physics and molecular biology, has won a $1.6 million award from the Paul G. Allen Family Foundation. This is the first award given to a UC San Diego recipient from the Foundation, which was established by the co-founder of Microsoft to support high-risk, highreward ideas in science. Suckjoon's effort is one of five awards announced by the Foundation to projects that aim to unlock key questions in cellular decision-making and modeling dynamic biological systems. “I am hoping to develop tools and methods that will ultimately help us answer some of the most fundamental questions in biology,” Suckjoon said after winning the award. “I am deeply grateful to the Paul G. Allen Family Foundation for believing in young scientists pursuing big, but risky, questions.” Undergraduates Geoffrey Stanley and Minyoung You have received the Deanʼs Award for Excellence. Geoffrey works in Prof. David Kleinfeldʼs lab and is headed for graduate work at Stanford University. Minyoung, who is also the recipient of the Norm Taylor Award, is an undergraduate in Prof. Brian Keatingʼs lab, and she is moving on to Caltech. Congratulations Geoffrey and Minyoung! Chelsey Dorow, an incoming graduate student, has won the Harold Ticho Award. Frederick Matsuda, a graduate student in Prof. Brian Keatingʼs lab, has won an Inamori Foundation Fellowship. Frederick, right, is pictured below in a group with Dr. Inamori. Terry Hwa has been elected to Fellowship in the American Academy of Microbiology. Fellows of the Academy are elected annually through a highly selective, peerreview process, based on their records of scientific achievement and original contributions that have advanced microbiology. There are more than 2,000 Fellows representing all subspecialties of microbiology, including basic and applied research, teaching, public health, industry, and government service. Terry's lab is interested in attaining a quantitative, predictive understanding of links between molecular interactions and physiological responsesPellentesque: in bacteria, focusing mostly on E. coli. They use a complementary twopronged approach. In a bottom-up approach, his lab performs quantitative characterization of combinatorial transcriptional control and post-transcriptional controls to construct quantitative models of gene regulation based on molecular properties. In a top-down approach, they characterize phenomenological laws governing bacterial growth, metabolism and gene expression. The phenomenological laws can be exploited to provide precise quantitative predictions between physiological perturbations and responses; they can also be used to guide the elucidation of molecular signaling mechanisms. Alison Coil has been awarded extensive access to the Keck Telescope. Alison is the co-PI of a major new faint galaxy redshift survey underway at the 10-meter telescope on Mauna Kea, Hawaii. The MOSFIRE Deep Evolution Field (MOSDEF) survey will exploit the new capabilities of a new multiConsectetuer: object near infrared spectrograph called MOSFIRE, built at the UCLA Infrared Laboratory. Using this new spectrograph, the MOSDEF survey will target 2,000 distant galaxies lying 9 to 11.5 billion light years away. With these data, the team will obtain rest-frame optical spectra to study the stellar and gaseous content of very young galaxies, charting galaxy evolution when the Universe was only 2-4 billion years old. Alison will study the growing supermassive black holes in these distant galaxies. The MOSDEF team has been awarded 47 observing nights on the Keck I telescope for the survey, which will take four years to complete. MOSDEF is a UC-wide collaboration; additional co-PIs include Alice Shapley (UCLA), Mariska Kriek (UCB), Naveen Reddy (UCI), Brian Siana (UCI), and Bahram Mobasher (UCI). 5 Faculty Spotlight: Vivek Sharma Hunting the Higgs and preparing for the next Discovery July 4, 2012 marked one of the most monumental days in the history of physics: the public announcement that researchers had discovered a Higgs-like boson, the theoretically predicted particle that imparts mass to all elementary particles in the universe. Prof. Vivek Sharma, leader (2010-11) of the international Higgs search team of the CMS experiment at CERN that includes UCSD Professors James Branson, Frank Würthwein, and Avi Yagil, spoke about the epic hunt, and the work ahead to complete the portrait of this discovery and the searches for new physics beyond the Higgs boson. BRUCE LIEBERMAN: Take me back to the announcement of the discovery on July 4, 2012. What was it like to be there? VIVEK SHARMA: The 4th of July was the day we announced the beginning of the end of a search, a decades-long world-wide search, for a fundamental piece of knowledge which was crucial to understand how the universe got to be the way it is – where the mass in the universe came from. It was a very suspenseful day. Being there was an exhilarating and simultaneously an exhausting experience. Most importantly I was very curious what our competing experiment, ATLAS, had to say because we did not know what their results would be. The suspense was very high as far as whether they would agree with our observations and discovery, or whether their data would point to something contrary – which would have been VERY interesting. But the scene, for those who were not directly involved in the search, was something like a Super Bowl party. There wasn't any tailgating, but people had lined up from the night before. I remember going to the cafeteria for a late dinner and seeing people outside on the steps of the auditorium, snaking all the way down to the street with their sleeping bags just to get a seat in a rather small auditorium designed for about 500 people. The day before the announcement several of us were doing final crosschecks of our results, and helping prepare the presentation that the head of our experiment would give. I had also been fielding a barrage of frantic calls from newspapers and television stations, and conducting Skype interviews with television people, including one in San Diego. So it was, all in all, a pretty tense and exhausting day. LIEBERMAN: How would you encapsulate the reaction of the layperson on this important discovery? SHARMA: The layperson was actually very, very deeply engaged. They had been following the Higgs chase since the LHC, the worldʼs highest energy accelerator, started smashing protons in 2010. And we were very surprised and a little bit scared by how enthusiastic people from all over the world were. People found out my e-mail address, and there were tons of email queries and I was quite overwhelmed by them. I think people got the sense that something very important was going down, and that this discovery was confirmation of the basic postulate made back in 1964 – where the mass in the universe comes from. I think it's important to realize that if the electron and other elementary particles were massless, then there would be no atoms, no molecules, no chemistry, no biology, not us, not galaxies. None of this would exist. And I think this is something that the public may not have realized at first, but they caught on quickly when this particle was dubbed the “God Particle” because it actually is the particle that is necessary to explain our existence in the universe. Iʼve tried to communicate this central theme, in a proper scientific context, to newspapers, television crews, and through one-on-one interactions with students at UCSD and elsewhere. UCSD students have been very curious, and some of them went on to write essays for their writing classes on this discovery. Public lectures are very important to communicate the thrill of this discovery, partly because our science is funded almost entirely by the taxes of the citizens of this planet. It's very important to convey to them what it is that we have discovered – the return on 6 their investment. LIEBERMAN: The UCSD Physics Department has had a large role in this search. Tell me about this. SHARMA: UCSD has played an important role in this discovery, on several levels. For example, the Physics Department was very helpful when I was appointed the coordinator of the Higgs search by CMS. This required me to be present at CERN for the duration of the search, which turned out to be about 2 1/2 years, and the Department and the Dean (along with financial assistance from the US Department of Energy) was kind enough to find ways to give me teaching relief and other flexibility so I could go run the search from Geneva, Switzerland for 2 1/2 years. The UCSD experimental particle physics group has contributed in very strong ways to several aspects of the construction and excellent performance of the CMS detector. For example, in data acquisition, in tracking charged particles that are produced in these protonproton collisions, in the development of software to analyze the data, and in the enormous amount of computing, utilizing worldwide computing infrastructure, that is required to search through petabytes of data representing trillions of proton collisions and find these rare handful of events that would prove to be the first evidence for the Higgs-like boson. LIEBERMAN: False alarms occurred periodically in the months leading up to the discovery. You referred to them as “good drills.” What did you mean by that? SHARMA: When the LHC started smashing protons together in 2010, we didn't really know what exciting discoveries lay ahead. So we had to be ever vigilant, and be able to come together – and these are large international groups of people – as a rapid response team. We routinely went through mock exercises to prepare ourselves, to make sure that all the resources were in place and ready to be deployed very quickly. But these were mock challenges and everyone knew that it was just a drill. So when the first serious ATLAS rumor occurred in April 2011, this provided a real-life test of this rapid response team we had set up at CMS. And we came out in flying colors. In what I dubbed as the “Easter Bump Hunt” we activated and mobilized this international team of the best physicists, young and not so young and many from Europe, over the Easter weekend. Easter is a very special holiday in Europe, so being able to corral people away from their holiday and get them going on the search was a big deal. Checks in our data lasted about five days, and in that short period we could quickly rule out the ATLAS rumors. In that sleepless five-day stretch we analyzed trillions of collisions and came to a definite conclusion. That's the kind of furious pace that was needed and that's what was done, and we showed to ourselves and to the world that we could do it correctly. That's why it was a very good drill for what would come ahead. The April rumor turned out to be a false alarm, but we did not know how much collision data we would need to acquire before some kind of real Higgs signal would come about, and when we would see that signal then we would have to react very quickly. LIEBERMAN: So now we had this 5 Sigma th confidence of the Higgs detection on the 4 of July, and reflecting back youʼve commented that every measurement you've made in your career has been a confirmation of the standard model of particle physics. Youʼve said that if we did not discover the Higgs, that in some respects that would've been more exciting. SHARMA: Much more exciting! The common theoretical expectation was that there would be a Higgs boson of some kind. People were unsure about what its mass would be, although several were betting that this would be around 114 to 170 GeV (1 GeV is roughly the mass of a proton). But if these detectors, CMS and ATLAS – both of which were capable of searching and finding the Higgs boson, if it existed over a very large mass range – failed to find a particle like that it would have basically killed the conjecture of the Higgs field. That would've caused a revolution in physics, in our knowledge of the underlining theory of the behavior of subatomic particles. So in some sense, it would be like a time before the dawn of quantum mechanics, and the revelation that there was much more to physics than what classical physicists had distilled by 1899. If we had not found this Higgs-like boson, the first thing I and people like me involved in the search would have had to do is to convince everybody that we didn't screw up! Because that's one way of not finding something – to have a detector where you think you can find it and setting a trap where you think something will come in, and then your trap is just loose or wrong and the particle escapes. So it would've been a priority to show everybody that had the Higgs existed, we would've found it and the fact that we didn't find it meant it simply didn't exist. LIEBERMAN: So, what would you be doing now if the Higgs had not been found? SHARMA: If the Higgs boson did not exist, then the mystery of how mass originates in the universe would 7 still remain. And, it would definitely point to the fact that there is something much more mysterious than the Higgs field around in our universe. We know that things have mass, atoms are as compact as they are, so there must be something that is giving these particles mass because our existing theory without the Higgs field conjecture is a theory of massless particles. It doesn't describe massive particles. So, somehow somewhere there has to be a symmetry breaking and that basically means that there's some exciting new physics that is just around the corner. So at this moment, had there been no Higgs boson discovery we would be searching for different signatures of alternatives to the Higgs field, and the Quantum particles associated with it, trying to find out what is causing sub-atomic particles to have mass. Any one of these alternatives could have shown up in our detectors two days later or two months earlier. When you don't know what the alternatives are, you don't know when it's going to show up in your detector. That's the thing about research at the bleeding edge: a discovery could be two days or years away. LIEBERMAN: At what point did you become confident the Higgs discovery was at hand? SHARMA: On Thanksgiving, 2011 I knew. By October, we had finished taking data and analyzed the entire data in two or three weeks that followed. I came home from Geneva for Thanksgiving, but my postdocs were busy working at CERN. Thanksgiving dinner started around 4 pm, which is at the end of the day in Europe, and by that time they had produced a plot synthesizing results of all Higgs searches that showed that we had ruled out the Higgs boson everywhere except in a tiny mass window near 125 GeV where we were seeing an evidence of a signal. So this became a special Thanksgiving for me! Soon after, in the December 13, 2011 public meeting at CERN, CMS showed this evidence and ATLAS had a similar result. Although 3 sigma signals, shown by the two independent experiments, rarely go away, we wanted to keep the excitement down. At this meeting, each experiment showed their data but made no strong claims of a discovery. We just said that we were seeing something that looks and quacks like a Higgs boson. But we needed more data to really say for sure. That's th what brought us to 4 July 2012. LIEBERMAN: The next stage of this work is to investigate the DNA of this Higgs-like particle. How is it more of a marathon race, and what will be your strategy? SHARMA: Discovering a new particle is like a sprint and it goes very quickly. In the case of the Higgs it took about a year of taking data to discover something that looks like it. The next question is, “What exactly have you discovered?” And this requires that we carefully analyze the DNA of this new boson. This is a task that requires much more data so that we can be quite precise. And in that sense, it's a marathon compared to a sprint. This DNA characterization is basically checking that the particle that we have discovered is THE scalar particle predicted in the Higgs conjecture. The theory predicts very accurately the rate at which the Higgs boson would decay into a bunch of familiar particles like electrons or muons or quarks. And we have to establish that these particles decay into those familiar forms, and then measure the rate of disintegration very precisely. Then, we have to compare all this with what the theory predicts. If this comparison works out within a small margin of error, then our portrait of this particle would be complete, and we can confirm that what we have found is indeed the predicted Higgs boson. We are currently putting together this picture, a complete portrait, if you will. And that is a slow and methodical process. With more data th taken since the July 4 announcement, we already have a pretty good characterization. The portrait that we have so far is based on the data that we took until October of last year, which is essentially 2 1/2 times the data that we had when we announced the discovery in July 2012. From these studies, it begins to look like the DNA of this particle is just like that of the particle that Peter Higgs et. al. predicted. But we need to make a very sharp portrait to make sure this is indeed the Higgs boson and not some look-alike imposter. To complete this portrait weʼll need much more data, and that will be coming when the LHC starts colliding protons again in the spring of 2015. LIEBERMAN: Are you amazed by the fact that the portrait that you're filling in matches so closely with what Peter Higgs predicted? SHARMA: I think the people who would be most pleased are Peter Higgs and other theorists who came up with this conjecture. For me, it's pretty cool that the portrait we have so far is close to that of the Higgs boson and that it took experimentalists like me to find it in less that two years since the first LHC collisions began. LIEBERMAN: What is the next frontier for the LHC? SHARMA: The LHC accelerator is being upgraded to be able to smash protons with almost twice more energy. The primary purpose of the LHC is to search for new particles and the new phenomena that they would herald. When the machine turns on again in 8 2015, we will continue these investigations. We know that there is new physics beyond our current theory, the standard model, but donʼt know what the nature of this new physics might be. So discovery of a new massive particle will give us the needed direction. And because it could be one of several directions, the thrill of the hunt is quite a bit heightened and we are looking at all possible scenarios. This is different from the hunt for the Higgs boson, where we had a good idea of what it was supposed to look like. We knew all its properties except its mass. So we were hunting for a subatomic “animal” that was more or less very well characterized. But in this next stage of the hunt for new physics, we know that there is something exotic in the sub-atomic jungle, but we don't know exactly what it is. So it's a very different way of approaching the searches. If you don't know what exotic animal you are hunting for, you set traps for almost every form of the animal that you imagine is out there. And you set the traps and wait. You take more data, and see whether something extraordinary has walked into your traps. That is what we are preparing for now. With luck, some of these discoveries may come as early as Christmas 2015! *** 9 UC San Diego Physics – Funded! Faculty members continue to be awarded research grants at an increasing rate, with total department funding for the academic year of $16 million. Notable special funds have included: Simons Foundation gives $4.3 million for expansion of CMB cosmology project ONRʼs MURI program awards $7.5 million for nervous system study Where do we come from? What is the universe made of? Will the universe exist only for a finite time or will it last forever? These are just some of the questions that University of California, San Diego physicists are working to answer in the high desert of northern Chile. The Office of Naval Researchʼs MURI program, an interdepartmental, interdivisional group of UCSD faculty led by Physics Professor Henry Abarbanel, has won a $7.5 million, five-year award from the US Office of Naval Research. The project will study the biophysical dynamics of functional nervous system activity through theoretical analysis, numerical simulation, and laboratory experiments. Other UCSD participants include Gert Cauenberghs, Professor of Bioengineering; Tim Gentner, Professor of Psychology; Katja Lindenberg, Professor of Chemistry and Biochemistry; Misha Rabinovich of the BioCircuits Institute; and Terry Sejnowski, Professor of Neurobiology. There are also participants from the University of California, Berkeley and the University of Chicago, with UCSD as the lead institution. Twenty MURI awards annually are announced by the US Department of Defense after a competition among several hundred applicants. UCSD has led and participated in many MURI efforts over the years, including several within the Department of Physics and several others within the now BioCircuits Institute. The Simons Foundation has awarded $4.3 million in funding for construction and installation of two new telescopes to measure universe at its inception. Armed with a massive 3.5-meter (11.5 foot) diameter telescope designed to measure space-time fluctuations produced immediately after the Big Bang, the research team will soon be one step closer to understanding the origin of the universe. The Simons Foundation has recently awarded the team a $4.3 million grant to build and install two more telescopes. Together, the three telescopes will be known as the Simons Array. “The Simons Array will inform our knowledge of the universe in a completely new way,” said Brian Keating, associate professor of Physics at UC San Diego's Center for Astrophysics and Space Sciences. Keating will lead the project with Professor Adrian Lee of UC Berkeley. UCSDʼs Prof. Hans Paar is also a co-PI. Fluctuations in space-time, also known as “gravitational waves,” are gravitational perturbations that propagate at the speed of light and can penetrate through matter, like an X-ray. The gravitational waves are thought to have imprinted the primordial soup of matter and photons that later coalesced to become gases, stars and galaxies - all the structures that we now see. The photons left over from the Big Bang will be captured by the telescopes to give scientists a unique view back to the universe's beginning. The telescopes of the Simons Array - named in recognition of the grant - will focus light onto more than 20,000 detectors, each of which must be cooled nearly to absolute zero. The result will provide an unmatched combination of sensitivity, frequency coverage and sky coverage. 10 Three Generations in Physics Three generations of physicists at UCSD completed and analyzed the first angiome, which is a fully vectorized reconstruction of the vasculature from the cortex of a mouse. Philbert Tsai, PhD 2004 (left); Harry Suhl, founding faculty 1961 (center); David Kleinfeld, PhD 1984 (right); and other colleagues worked on this project, which will appear as an article in Nature Neuroscience in July 2013. This work reveals the organization and rules that nature chose to traffic blood in and out of the brain and, as one application, provides a means to calculate when damage to even a single small blood vessel will lead to a stroke. Please see our Q&A interview with Prof. Harry Suhl, on the next page of this newsletter. 11 Milestones: Harry Suhl Harry Suhl, Professor Emeritus in the UCSD Physics Department since 1991, has had a long and distinguished career in physics that began as a young man helping to develop radar technology for the British Admiralty during World War II. Dr. Suhl is a specialist in statistical mechanics, critical effects in non-equilibrium systems, magnetism on macroscopic and mesoscopic length scales, reaction kinetics and non-linear dynamics. Dr. Suhl has explained many phenomena, among them the nonlinear effects in ferromagnetic resonance, known as the Suhl instability. Department Chair from 1965 to 1968 and again from 1972 to 1975, Dr. Suhl also was the former director of UCSDʼs Institute for Pure and Applied Physical Sciences from 1980 to 1991. Below is a wide-ranging conversation with Dr. Suhl about what heʼs up to now, his current interest in neuroscience, and his life-long love for physics. BRUCE LIEBERMAN: How have you been spending your time lately? HARRY SUHL: Since I retired, I mainly have been a house theorist for the Physics Department. That's meant to be a person who takes interest in the theoretical problems of various experimental groups and tries to help. LIEBERMAN: Tell me about your work with Prof. David Kleinfeld. SUHL: His project was concerned with blood flow in the brain, which goes through a very elaborate network, and there is a whole branch of mathematical physics called network theory. Networks, even though they have superficially random properties, have certain inherent regularities. And some of these regularities are very complicated mathematically, and I collaborated with Kleinfeldʼs group on exploring some of the mysteries of these vascular networks in the brain. LIEBERMAN: For people who are not scientists, the connection between physics and neuroscience is not immediately obvious. SUHL: Neuroscience is not yet at the stage where you can have really detailed deconstructive theories, so the connection between neuroscience and physics is at very early stages. Neuroscience is still at the stage at which we are partly guided by the behavioral aspects of it. The actual workings of the brainʼs neural network, the computational aspects of it, are not yet thoroughly understood. One important aspect of Kleinfeldʼs study is how the brain is supplied with energy by the bloodstream. That is what his people have been interested in for a number of years now. LIEBERMAN: How did you get involved in the collaboration? SUHL: I do physics mainly for fun, and when there's a challenging problem I like to look at it – partly to amuse myself, now that I'm retired, and partly because it sometimes has important applications. When David talked to me about the brainʼs vascular network, I realized that there may have been some theoretical applications there, so I decided to look at it. LIEBERMAN: What was it like working across generations on this project, I mean, with Dr. Kleinfeld and then also his postdocs and students? Is there something special that happens when someone as experienced as yourself works across generations? SUHL: Yes, I really think those connections are very important. An experienced theorist can help what is happening on the experimental side. Let me put it this way: really successful experimentalists like David Kleinfeld do not absolutely need a theorist. But they would still like to have theorist, because it does clarify their appreciation for what they are doing. So, experimentalists don't absolutely depend on us theorists for their daily bread, so to speak. But if theorists can help them, they can only appreciate that help. Sometimes we make it easier for them to come to a conclusion in their work. I think this in particular happened to some extent in the case of myself and Kleinfeld. LIEBERMAN: What was, say, one clarified for Dr. Kleinfeldʼs group? thing you SUHL: Let me give you one example. Networks consist of connections between so-called nodes or vertices, and networks can be classified according to the number of strands connected to a particular node or vertex. There is a theorem in network theory that says that if each and every node has only a fixed number of connections, then the network will not split up into a large number of sub-networks. By splitting up into subnetworks, I mean smaller networks that are not connected to the majority of the primary networks. I'm only giving you a rough version of that theorem. LIEBERMAN: Why wonʼt the network split up into a large number of sub-networks? 12 SUHL: That requires a moderately elaborate argument. Practically every node in the vascular network has just three connections coming out of it, and so it cannot split up into a significant fraction of smaller networks. Now, the theorem is a quite difficult proof; however, I was able to give them a still rather elaborate heuristic argument. In the end, if there are just three connections per node there can only be an infinitesimal number of sub-networks that have split off. Itʼs a vanishingly small number compared with the overall number of network connections. LIEBERMAN: As we talk here about your work in neuroscience, it reminds me that physics is really the foundational science of everything – in that it informs all other sciences. Or maybe thatʼs mathematics. SUHL: Yes, certainly physics is the foundation, and the most important toolbox of physics is really mathematics. Without that we would really be in trouble. LIEBERMAN: For the general public, that important role of physics and mathematics is not always obvious. SUHL: I wish everyone would understand that. The general public, in my experience, has been lumping together physics and mathematics as the single subject that they were not very good at in school. LIEBERMAN: But itʼs worth trying, because both physics and math is at the heart of so much of the physical world we see around us. SUHL: This would really help in many ways. It would remove people's illusions in many ways, and make them much more reasonable. LIEBERMAN: In what areas of society today do you think a more complete understanding of physics could help things? SUHL: Philip Anderson, a famous colleague of mine whoʼs a Nobel laureate, says that economics is presently in the state that biology was in before the discovery of DNA. It means that a true deconstructive quantitative understanding of economics, in his opinion, is totally lacking in the same way that genetics was lacking in the dark ages before the discovery of the double helix. LIEBERMAN: So what is this connection between physics and economics? SUHL: You mean how can economics benefit from physics? It couldn't immediately benefit from experimental physics, but theoretical physics could certainly be an enormous help. What would be particularly important is developing a statistics for rare events – the black swan events. In other words, someone will find out the actual occurrence rate of rare events, and today that is not understood in any way. For example, the concept of risk management. The very phrase, “risk management,” is a contradiction in terms because if it is manageable it isn't a risk. And if it's a risk it is not manageable. I'm making an extreme statement here, but the science of risk management is not yet a true science. That I'm sure was Anderson's point when he said that we are in the “pre-DNA” stage of economics. LIEBERMAN: Do you think that some of the same tools physicists use to solve problems can be applied to our understanding of economics? SUHL: I would not go as far as to say that the existing state of physics would be helpful in economics. However, inspired individuals and people having random thoughts may one day turn the tables and make physics highly relevant. Right now, it is not too relevant because we do not understand the statistics of rare events. LIEBERMAN: What other areas of society could benefit from a more complete understanding of physics? SUHL: Society could benefit from a better understanding of limitations in the information revolution. Let me just give you an example: there is Moore's law that talks about information storage capacity doubling every two years using existing technology. But that runs into a limit that is set by quantum mechanics. Therefore, an appreciation by the public of the limitations on our developments, as dictated by quantum mechanics, is important. Now, that doesn't mean that those limitations won't be overcome one day by totally unexpected insights into the nature of things. But for the time being, an understanding of the limitations would be very valuable. The other thing that would be useful to understand is that there is an outside chance that the very limitations that quantum mechanics imposes on existing computing may be turned into an advantage in communications. For example, you can have essentially unbreakable codes for communications purposes if they use quantum mechanical principles. That is still a long way from general application, maybe 20 to 50 years from now, but eventually it will probably happen. LIEBERMAN: Unbreakable codes? SUHL: Unbreakable communications. Communications that can be kept totally secret either from enemies or 13 from competitors. That's an obvious application. This could also have consequences for the preservation of privacy, at least what is left of privacy, for individuals. But that's a long way off. LIEBERMAN: The human mind can think up all kinds of experiments, and the true limit is not the human mind but the resources available to act on big ideas. LIEBERMAN: Now that this project on neuroscience is behind you, what are your interests looking forward? SUHL: On the other hand, I do believe it's possible that the human mind will never have limitations. It will eventually find some answers without involving vast expenditures. SUHL: Iʼll return to some of Kleinfeld's problems and work some more on network questions related to blood flow in the brain. Eventually Iʼd like to get into the architectural structure of the brain computing system, which is another project in Kleinfeldʼs laboratory and many other laboratories on campus. LIEBERMAN: What do you think of big projects like the recently announced brain mapping project heralded by President Obama? SUHL: I remember in 1970 or ʻ71 President Nixon had a similar scheme for conquering cancer. Of course, it hasn't conquered cancer. Certainly, throwing money at a project helps; it sets the stage and raises the possibilities of making substantial advances. But to hope that these large projects will lead directly to cures or some other solution – that is a little bit fanciful. It isn't all a question of money. LIEBERMAN: What are the other key ingredients? I would imagine a focused goal and expected outcomes. SUHL: It helps to develop a focus. I'm sure that the money thrown at cancer research certainly has improved the survival chances, even if it hasnʼt totally cured cancer. LIEBERMAN: In general, what you think of these big science projects that have broad goals, for example mapping all connections in the human brain? SUHL: I do believe that any civilized society should devote a fraction of their efforts toward undefined goals. But they just should not raise expectations too high. LIEBERMAN: The Large Hadron Collider in Europe, where the discovery of the Higgs boson made such big news last year, is certainly an example of big science alive and well. SUHL: The current LHC experiments will not be the end of it. It will just generate new questions. At some point, the available resources of these science experiments will run against a limit. Already some people are dreaming about a particle accelerator in outer space. LIEBERMAN: Through theoretical advances? SUHL: Yes, yes. Einstein thought up relativity. That did not immediately cause huge expenditures for experiments. I imagine there will be future theoretical advances that may or may not be outside of what we can experimentally verify. It's very hard to predict things. LIEBERMAN: Do you think the public investment in physics and science today is adequate? At the University of California, for example? Certainly the level of investment in physics pales today in comparison to the second half of the 20th century. SUHL: I feel that certainly it is not a good idea to curtail funding for projects that have implications for other branches of science. For example, you do not want to curtail research in x-ray crystallography – the kind of research that has enormous implications for biology and human health. If you have to curtail science for economic reasons, don't curtail it in areas which are instrumental for very broad areas of human existence. Whether you want to curtail it, for example, in cosmology or the search for dark matter in the universe, that is a more delicate question. LIEBERMAN: You might be getting yourself in trouble here with a few of your colleagues. SUHL: I know. I know. Everybody has to make the best judgment they can think of. I'm not saying my opinion should prevail, but if you have limited resources you have to make choices. Let me make one more comment about cosmology: the advances made in areas of great importance to other fields, like communications, the semiconductor industry, and so on have also made it possible to make measurements in cosmology that were totally out of the question a few years ago. Thus, there have been advances in cosmology that are a direct result of advances in physics generally. To the extent that you want to continue work in cosmology, which is something to remember. OK, that's all I have to say. 14 LIEBERMAN: Tell me about your routine during the day. How many days a week to go to the University? SUHL: I go about two to three days a week. When I'm not at the University – I donʼt have many hobbies – Iʼm working from home on the computer. I don't know, I don't really have many interests outside of physics. LIEBERMAN: What book are you working on right now? SUHL: I just finished reading something about a guy who was instrumental in bringing radar research to the United States during World War II. LIEBERMAN: And that of course is something you were involved in as well. SUHL: Thatʼs right. During World War II I was a scientist working for the British Admiralty on radar. So this book was very interesting to me. LIEBERMAN: Radar, and the RAF, saved Great Britain. SUHL: Yes, there is no doubt about that. Radar also saved everybody from a much longer war. LIEBERMAN: World War II was one of the defining events of your life like so many others, wasnʼt it? SUHL: Yes, I would say that. I was born in Germany, and we had to leave because of Hitler. I had developed a little bit of interest in mathematics in high school in Germany, where I had one rather good math teacher. When we came to England in 1939, it was obvious that the war was brewing and I had a strong feeling that science was going to play a major role in it. can't allow you to just continue studying until you get a PhD, but we can put you into a scientific branch of the services.” And so he got me into the British Admiralty in their radar research branch. I got to know various older scientists working for the government, including Fred Hoyle, the astronomer. Fred Hoyle was, in fact, one of my thesis examiners at the University of Oxford. LIEBERMAN: How do think the experiences of young people from your generation are fundamentally different from those experienced by young physicists today at universities and colleges? SUHL: Well, they are better off, of course. The new generation is much better off. I also think they are motivated in a different way than we were. They don't face the same existential threat. It's not a matter of life and death for them, that they should do something important for society, as it was for us. Still, a certain fraction of them is highly motivated and very ingenious. They seem to have a greater mental capacity than my own generation, and that may just be the consequence of better food and better healthcare. I am serious. I think that greater physical ease helps you to concentrate on more important things. *** Prof. Ivan Schuller conducted a video interview with Harry Suhl in November 2012. You can see it here: http://www.youtube.com/watch?v=NAJeOuS7TlA I started to get books out of the local library on calculus and all kinds of things. Then I was interned when France fell. The British interned all German refugees, at least the males, in various interment camps. A large fraction of the German intelligentsia was interned. At the time I was only about 17 or 18 years old, and they ran lectures for me, including some physics lectures, and that is where I really got interested in the subject. You know, when you're 18 years old, the fact that your interned and not getting much to eat and so on doesn't seem to be all that important. LIEBERMAN: So that difficult period of time actually placed you in an environment where you were able to learn from some of the brightest minds from continental Europe. SUHL: When I became interned, I was a student and so I was allowed to go to the University. My interest in physics grew there. C.P. Snow (the British scientist and writer), came around to interview people at the University to recruit people for war work. He interviewed me, and at that point I was very close to my so-called bachelor of science degree at the University of Wales. He said, “We 15 UC San Diego Physics – In the News Traveling to Chile on the way to the beginning of space & time Prof. Brian Keating was profiled recently in UT San Diego as one of several traveling researchers this year. Brian plans to travel to Chile in September to work on a cosmology project called POLARBEAR, which is studying polarization patterns in light from the cosmic microwave background in order to search for evidence for the theorized epoch of inflation. You can read the UT San Diego story here: http://www.utsandiego.com/news/2013/may/05/pacificexplore-science/ Paving the path toward quantum computing … With scotch tape! Work by Ken Burch, PhD 2006 and now at the University of Toronto, was profiled in the magazine Wired last fall. His teamʼs studies showed that two-sided Scotch tape can be used to transfer superconducting properties to a semiconducting material. That semiconductor is similar to what is found in todayʼs microprocessors, and microprocessors engineered with superconducting properties are on the way toward becoming quantum computers. Quantum computers, unlike todayʼs binary computers that store information in bits, can store multiple pieces of information at the same time. You can read the Wired story by going to: http://www.wired.com/wiredenterprise/2012/09/scotchtape/ Ken is also the recipient of the Lee Richardson Ocherof Prize. Chasing the Higgs boson Prof. Vivek Sharma was profiled this past spring in the New York Times epic feature article and multimedia package on the hunt for the Higgs boson. Reporter Dennis Overby gave Vivek top billing, beginning the article with his name. You can read it here: http://www.nytimes.com/2013/03/05/science/chasing-thehiggs-boson-how-2-teams-of-rivals-at-CERN-searchedfor-physics-most-elusiveparticle.html?pagewanted=all&_r=0 You can read more about the involvement of Vivek and other UCSD physics researchers in the Higgs boson search in this newsletterʼs Q&A feature. Sunil Sinha study makes the cover of Nature Materials Professor Sinha and student Yicong Ma were the authors of the paper, Long-range interlayer alignment of intralayer domains in stacked lipid bilayers, which was featured on the cover of the December 2012 edition of Nature Materials. The article was published online in October, and you can read it here: http://www.nature.com/nmat/journal/v11/n12/full/nmat3 451.html David Smithʼs work on “invisibility cloaks” profiled in U-T San Diego David Smith, who earned his PhD at UCSD and is now at Duke University, was interviewed by UT San Diego in February on his work on developing materials that make small objects invisible to microwave energy. By cloaking objects in these meta-materials – David and his team use copper, which can be arranged in a pattern that causes microwaves to refract – the materials cause the microwaves to go around the objects. The article in U-T San Diego can be found here: http://www.utsandiego.com/news/2013/feb/24/cloakucsd-edu/ 16 Giving Opportunities The study of physics is special. Physicists strive to understand why our universe exists, how fundamental laws govern the motion of galaxies as well as everyday encounters, and what the role of intelligence is in the face of harsh physical reality. Physics informs us of what is possible, from communicating by cell phones to predicting the growth of black holes, and what is impossible, such as defying gravity. It serves as the foundation of all of science, be it biology, medicine, or physics per se. Education in physics is also special. It emphasizes how to solve problems. Advances in physics allow scientists and engineers to formulate new technologies and initiate new industries. This in turn drives economic growth and leads to a better tomorrow for society. The Physics Department at UC San Diego has a worldclass faculty that attracts some of brightest scholars in the world, but it needs your help to continue to thrive and grow, especially in the current economic climate in California. Your tax-deductible gift of any amount, whether $50, $500, $5,000, or $5 million, will make a difference and allow you to create a living legacy. Our current areas of focus are: • Physics Activities Fund: supports a broad range of instructional and research activities in Physics. (Fund #42116) • Physics Department Memorial Lectureship Fund: supports public lectures by renowned physicists. (Fund #37466) • Harold Ticho Award: provides an outstanding incoming graduate student with a stipend during their first year in graduate school. (Fund #4635) • Young Physicists Program: supports outreach to middle school and high school students. (Fund #86142) • UCSD Experimental Biophysics Endowed Chair: supports a proposed faculty chair. (Fund #4555) Connecting with UCSD Physics UC San Diego has made a significant investment in alumni relations so that alumni can find meaningful ways to stay connected to the university. For more information on how to reconnect with the Department of Physics, please contact our alumni officer: Tamika A. Franklin Assistant Director, Alumni Programs / Division of Physical Sciences 858.246.0327 (O); 619.358.3338 (M); t1franklin@ucsd.edu Contributions to these activities may be made by: • • credit card, electronic funds transfer, or UC San Diego payroll deduction through our secure online site (go to htp://physics.ucsd.edu/visitors/alumni_giving.php to select a fund and access the secure giving site); or check payable to the “UC San Diego Foundation” (complete the donation form on the next page, specifying one of the funds listed above, and mail both to: UC San Diego Gift Processing, 9500 Gilman Drive, MC 0940, La Jolla, CA 920930940). Additional giving options For information on additional options, including gifts by phone, pledges (i.e. a gift paid over 3-5 years), and planned gifts (e.g., a bequest through a will or charitable trust), please contact: Ms. Melanie Cruz, Senior Director of Development, Division of Physical Sciences phone: (858) 822-3258 email: mbcruz@ucsd.edu Thank you for your support! Private support and philanthropy enable the Department of Physics to continue to recruit and retain the best scholars and researchers who continue to make our academic program nationally competitive. Below are donors who have contributed to the Department over the past year: The Simons Foundation Paul G. Allen Family Foundation Thank you to other contributors who have generously helped to establish the Harry Suhl Colloquium Fund! 17 Donation Form UC San Diego Physics Department Date: _____________ Fund Name: _____________________________________________ Amount: $____________ In Memory of (if applicable): _________________________________ First Name: __________________________ Last Name: __________________________ Street Address: _________________________________________________________________ City: ______________________ State: ______ ZIP: _____________ Email address: ______________________________________________ Primary Phone: ______________________ ¡ home ¡ cell ¡ work Make your check payable to “UC San Diego Foundation” and mail it along with your completed form to: UC San Diego Gift Processing 9500 Gilman Drive, #0940 La Jolla, CA 92093-0940 18