qsd_workshop

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INTERNATIONAL WORKSHOP

on

QUANTUM SPECTRA AND DYNAMICS

28 June – 5 July, 2000

Institute of Theoretical Physics

Technion – IIT

and

Einstein Institute of Mathematics

&

Edmund Landau Center for Research in Mathematical Analysis

& Related Areas

Hebrew University of Jerusalem

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PROGRAMME

Wednesday 28th June

09:30-10:20 Registration

10:20-10:30 Welcome

10:30-11:20 Jan Philip Solovej : University of Copenhagen

The correlation energy of charged quantum systems

11:30-12:20 Ofer Zeitouni : Technion

Quenched and annealed relations for random walks in random environments

12:20-13:30 Lunch

13:30-14:20 Heinz Siedentop: University of Munich

On the renormalization of the energy of the electronpositron field

14:30-15:20 Uzy Smilansky: Weizmann Institute

Edge states in magnetic billiards: exterior-interior

15:20-16:00 Coffee

16:00-16:50 Israel Michael Sigal: University of Toronto

Quantum mechanics at positive temperatures

17:00-17:50 David Damanik

:

Caltech

Application of combinatorics on words to spectral theory

21:00 Yosi Avron at Home

THURSDAY 29 TH JUNE

09:00-09:50 Claude-Alain Pillet: University of Toulon

Spectral theory of nonequilibrium steady states

09:50-10:30 Coffee

10:30-11:20 Barry Simon: Caltech

Approach to equilibrium in a forced burgers equation

11:30-12:20 Alexander Figotin : UC at Irvine

Nonlinear phenomena in periodic dielectric media

12:20-13:30 Lunch

13:30-14:20 Lorenzo Sadun: University of Texas, Austin

Geometry of adiabatic quantum pumps

14:30-15:20 Robert Schrader: FU Berlin

Kirchhof's rule for quantum wires

15:20-16:00 Coffee

16:00-16:50 Bernard Helffer: Universite Paris Sud

On semiclassical problems occurring in superconductivity

17:00-17:50 Folkmar Bornemann: Munich University of

Technology

The method of weak convergence and adiabatic theorem without a gap condition

19:00-21:00 Conference Dinner in Atlit

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FRIDAY 30 TH JUNE

09:00-09:50 Alain Joye: University of Grenoble

Semiclassical dynamics and exponential asymptotics

09:50-10:30 Coffee

10:30-11:20 George Hagedorn: Virginia Polytechnic Institute and

State University

A review of rigorous results on molecular propagation

11:30-12:20 Gian Michele Graf: ETH

Extended edge states in quantum Hall systems

12:20-13:30 Lunch

13:30 Free Afternoon

SUNDAY 2 ND JULY

09:00-09:50 Giovanni Gallavotti: University of

Rome, "La Sapienza" tba

09:50-10:30 Coffee

10:30-11:20 Leonid Pastur: Universite Paris 7

Random matrices related to unitary group

11:30-12:20 Alexander Kamenev: Technion

Wigner-Dyson statistics in the replica field theory

12:20-13:30 Lunch

13:30-14:20 Peter Stollmann : University of Frankfurt

Multi-scale analysis implies strong dynamical localization

14:30-15:20 Abel Klein: University of California at Irvine

A bootstrap multiscale analysis for random operators and applications

15:20-16:00 Coffee

16:00-16:50 Peter Hislop: University of Kentucky

The Wegner estimate and the density of states

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2

3

MONDAY 3 RD JULY

09:00-09:50 Yulia Karpeshina: University of Alabama at

Birmingham

Perturbation formulae for the two-dimensional periodic magnetic Schrödinger operator

09:50-10:30 Coffee

10:30-11:20 Peter Kuchment: Wichita State University

Complex analysis in spectral problems for periodic

Hamiltonians

11:30-12:20 Shmuel Agmon: Hebrew University of Jerusalem

On eigenvalues and resonances of holomorphic operator functions

12:20-13:30 Lunch

13:30-14:20 Ruedi Seiler: Technical University of Berlin

Bethe Ansatz solutions for Hotstadter type models

14:30-15:20 Francois Germinet: Universite de Lille 1 (USTL)

The spreading of wave-packets in quantum dynamics : a nonlinear lower bound

15:20-16:00 Coffee

16:00-16:50 Serguie Tcheremchantsev: University of Orleans

The non-spreading of wave-packets in quantum dynamics: dynamical localization

19:00-21:00 Conference Dinner at the Park Plaza Hotel

TUESDAY 4 TH JULY

09:00-09:50 Gunter Stolz: University of Alabama at Birmingham

The Bernoulli-Anderson model

09:50-10:30 Coffee

10:30-11:20 Werner Kirsch:

Spectral theory for sparse potentials

11:30-12:20 Stanislav Molchanov: University of N. Carolina at

Charlotte

Schroedinger operators with random sparse potentials

12:20-13:30 Lunch

13:30-14:20 Svetlana Jitomirskaya: UC at Irvine

Non-perturbative ac spectrum for quasiperiodics

one-dimensional Schroedinger operators

14:30-15:20 Alexander Kiselev: University of Chicago

WKB asymptotics of generalized eigenfunctions for onedimensional Schrödinger operators

15:20-16:00 Coffee

16:00-16:50 Christian Remling: Ludwig Maximillians University

Schroedinger operators with decaying potentials

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WEDNESDAY 5 TH JULY

09:00-09:50 Zeev Rudnik: Tel Aviv University

Quantum ergodicity for torus maps

09:50-10:30 Coffee

10:30-11:20 Frederic Klopp: Universite Paris-Nord

The monodromy matrix, the adiabatic wkb method and the spectrum of quasi-periodic operators on the real line .

11:30-12:20 Michael Aizenman: Princeton University

The statistical mechanics of Anderson localization

12:20-13:30 Lunch

13:30 End of Workshop

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5

ABSTRACTS

ON EIGENVALUES AND RESONANCES OF HOLOMORHIC

OPERATOR FUNCTIONS

Shmuel Agmon

Hebrew University of Jerusalem

We shall discuss perturbation formulas for (generalized) eigenvalues and resonances of holomorphic operator functions. Applications to embedded eigenvalues will be described.

THE STATISTICAL MECHANICS OF ANDERSON LOCALIZATION

Michael Aizenmann

Princeton University

We shall discuss some recent advances(*) in the mathematical analysis of the localization phenomena exhibited by operators with random potentials, as well as some related conjectures, which draw on analogies with the analysis of phase transitions in some basic models of statistical mechanics. [(*) Joint work with J.

Schenker, R. Friedrich, and D. Hundertmark.]

The analysis uses the fractional-moment decay condition as a convenient signature of localization. The results enable to conclude, for a wide range of discrete models: a strong form of dynamical localization, Poisson statistics for the eigenvalues, and other aspects of localization, over the entire regime for which localization follows by any of the currently available constructive criteria

(including the multiscale method). Also derived are some power-law lower bounds on the decay of the resolvent at any mobility edge.

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THE METHOD OF WEAK CONVERGENCE AND ADIABATIC

THEOREMS WITHOUTA GAP CONDITION

Folkmar Bornemann

Munich University of Technology

We will present a new method of proof for adiabatic results in quantum theory based on weak convergence in spaces of operator valued functions. This way the adiabatic theorem without a gap condition and semi-classical limits of quantumclassical models in quantum chemistry can be treated in a unified way. We will also adress the connection of our basic technical tool, a weak version of the hypervirial theorem, to the notion of semi-classical or Wigner measure.

APPLICATION OF COMBINATORICS ON WORDS TO SPECTRAL

THEORY

David Damanik

California Institute of Technology

We discuss recent developments in the spectral theory of one-dimensional quasicrystal models, that is, discrete one-dimensional Schrödinger operators with hierarchical potentials of low combinatorial complexity. Primary examples are given by Sturmian potentials and potentials generated by primitive substitutions.

Typical results are presented and the core ingredients to the proof strategies are discussed. We explain, in particular, that the essential part of the analysis consists of a detailed investigation of the combinatorial structure of a given potential.

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NONLINEAR PHENOMENA IN PERIODIC DIELECTRIC MEDIA

Alexander Figotin

University of California at Irvine

We develop a consistent mathematical theory of weakly nonlinear periodic dielectric media for the dimensions one, two and three. The theory is based on the Maxwell equations with classical quadratic and cubic constitutive relations.

In particular, the theory gives a complete classification of different nonlinear interactions between Floquet-Bloch modes based on indices which measure the strength of the interactions. The indices take on only a relatively small number of prescribed values collected in a table. The theory is based on the asymptotic analysis of oscillatory integrals describing the nonlinear interactions.

THE SPREADING OF WAVE-PACKETS IN QUANTUM DYNAMICS : A

NONLINEAR LOWER BOUND

Francois Germinet

Universite de Lille 1 (USTL)

Understanding what determines the spreading of wave-packets arises as an issue of the most interest in the last decade, motivated by numerical computations on quasiperiodic models. Guarneri's ideas, pushed further by Combes and Last, allowed one to get a lower bound on the dynamics expressed in terms of fractal properties (like the Hausdorff measure) of the spectral measure associated to an initial state

. However numerical computations suggest that more subtle fractal properties should be involved. In a joint work with J.-M. Barbaroux and S.

Tcheremchantsev, we derive a more refined lower bound that takes into account the generalized fractal dimensions

D

(

q

) of the spectral measure

, and supply rigourous results concerning the basic properties of these generalized fractal dimensions.

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EXTENDED EDGE STATES IN QUANTUM HALL SYSTEMS

Gian Michele Graf

ETH

A classical electron in a 2-dimensional domain

subject to a homogeneous magnetic field moves in a circle about some fixed center --- the guiding center --- as long as it does not hit the boundary



. If it does, the electron follows the boundary by repeatedly bouncing at it. The quantum mechanical counterpart should be given by the existence of extended edge states. This idea, first put forward by Halperin, is of some importance in connection with the quantum Hall effect. We prove the existence of absolutely continuous edge spectrum at energies away from the Landau levels, first for

a half--plane and then for more general domains. The result is stable under addition of some disorder potential.

The proof is based on Mourre theory. The conjugate operator, i.e., the operator increasing in time, is related to the position of the guiding center. This is joint work with J. Fröhlich and J. Walcher.

A REVIEW OF RIGOROUS RESULTS ON MOLECULAR

PROPAGATION

George Hagedorn

Virginia Polytechnical Institute and State University

The time-dependent Born-Oppenheimer Approximation is the main source of information about molecular propagation. It leads to an asymptotic expansion in powers of

 for solutions to the molecular Schrödinger equation. Here

4 is the electron mass divided by the mean nuclear mass. By applying an optimal truncation technique to this expansion, we obtain an approximation whose errors are bounded by C

1 exp(

C

2

/

2

) . A basic assumption of Born-Oppenheimer

Approximations is that the electron energy level of interest stay well separated from the rest of the electronic spectrum. The simplest violations of this assumption occur at crossings and avoided crossings. We describe the effects of these phenomena on the propagation of molecular wave packets.

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ON SEMICLASSICAL PROBLEMS OCCURRING IN

SUPERCONDUCTIVITY

Bernard Helffer

Universite Paris Sud

In the analysis of minimizers for a Ginzburg-Landau functional, a Schrodinger operator with magnetic field plays an important role. This leads in particular to new questions about the localization of ground states in connection with the old problem of the magnetic bottles.

THE WEGNER ESTIMATE AND THE DENSITY OF STATES

Peter Hislop

University of Kentucky

A new proof of the Wegner estimate with the optimal volume dependence is presented. The proof relies on new estimates for the spectral shift function. This proof implies the existence of the density of states for some new random models.

This is joint work with J. M. Combes and S. Nakamura.

SEMICLASSICAL DYNAMICS AND EXPONENTIAL ASYMPTOTICS

Alain Joye

University of Grenoble

We will describe some joint work with G.Hagedorn concerning constructions of approximate solutions to the time-dependent Schroedinger equation in the semiclassical limit by means of wave packets which are localized in phase space.

Our main result is an approximation which, under appropriate analyticity assumptions on the potential, agrees with exact solutions up to exponentially small errors. Further properties of this basic result, such as its long time limit or its scattering version, will also be discussed.

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WIGNER-DYSON STATISTICS IN THE REPLICA

FIELD THEORY

Alex Kamenev

Technion

Wigner - Dyson random matrix theory (RMT) appears to be the simplest (zerodimensional) case of the field theoretical treatment of a disordered media. Such deterministic field theory of random phenomena may be constructed employing either supersymmetry or replica tricks. The latter requires consideration of nonlinear action written in terms of n times n matrices, where in the end of the calculation n-->0 . We succeed calculating the corresponding functional integral in terms of multiple saddle points expansion. The central objects in this procedure are volumes of degenerate cosset space manifolds U(n)/U(p)U(n-p) , where p=0,1,...n

. Subsequent analytical continuation n-->0 leads to the exact

RMT results. However the detailed mathematical nature of this analytical continuation is not fully understood and requires more mathematical insight.

PERTURBATION FORMULAE FOR THE TWO-DIMENSIONAL

PERIODIC MAGNETIC SCHRÖDINGER OPERATOR

Yulia Karpeshina

University of Alabama at Birmingham

Asymptotic formulae for eigenvalues and eigenfunctions of the two-dimensional periodic magnetic Schrödinger operator are constructed in the high-energy region for a rich set of quasimomenta. The proof of the Bethe-Sommerfeld conjecture is a simple corollary of these formulae.

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SPECTRAL THEORY FOR SPARSE POTENTIALS

Werner Kirsch

University of Ruhr

This talk is about joint work with Dirk Hundertmark and Krishna Maddaly. We consider Schrödinger operators whose potential is "sparse" in the sense that it decays in some averaged sense at infinity, but does not go to zero pointwise. The main example is a random potential with decaying randomness. We prove the existence of both point spectrum and absolutely continuous spectrum for a large class of such potentials.

WKB ASYMPTOTICS OF GENERALIZED EIGENFUNCTIONS

FORONE-DIMENSIONAL SCHRÖDINGER OPERATORS

Alexander Kiselev

University of Chicago

We will present a new technique which allows to prove WKB-type asymptotics of generalized eigenfunctions (and, as a consequence, presence of the absolutely continuous spectrum) for a class of one-dimensional Schrödinger operators.

Another application leads to some results of optimal nature on the preservation of absolutely continuous spectrum for one-dimensional Stark operators with decaying or smooth potentials. This is a joint work with M. Christ

THE MONODROMY MATRIX, THE ADIABATIC WKB METHOD AND

THE SPECTRUM OF QUASI-PERIODIC OPERATORS

ON THE REAL LINE .

Frederic Klopp

Universite Paris-Nord

The talk will be an overview of recent results obtained in joint work with A.

Fedotov on the spectral theory of quasi-periodic Schrödinger operators on the real line. We will present the main object of our work, the monodromy matrix, explain how it relates to spectral theory. We will explain how to compute the monodromy matrix in the adiabatic limit. At last, we will describe the spectral results thus obtained.

COMPLEX ANALYSIS IN SPECTRAL PROBLEMS FOR PERIODIC

HAMILTONIANS

Peter Kuchment

Wichita State University

Spectral theory of periodic operators has attracted a lot of attention recently. It has been realized since papers published in 70s by J. Avron, S. Novikov, B.

Simon, L. Thomas, and C. Wilcox that complex analysis plays an important role in these studies. This becomes even more evident now. The talk will contain examples of complex analytic tools and problems ranging from generalized

Cauchy-Riemann equations, to irreducibility of analytic varieties, to uniformization of Riemannian surfaces that naturally arise in spectral problems for periodic operators (among which one can mention absolute continuity of the spectrum, absence of embedded eigenvalues, Liouville theorems, and others).

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1.

2.

3.

SCHROEDINGER OPERATORS WITH RANDOM

SPARSE POTENTIALS

S. Molchanov

(UNCC)

The sparse and slowly decaying potentials can describe some features of the

Anderson model with a small coupling, first of all the coexistence of a.c. and p.p. spectral components. The talk (based on the joint activity with V.Jaksic and

B.Vainberg) will present

Extension of Kato theorem to the class of the lattice Schroedinger operators with a sparse or slowly decaying random potentials

Structure of the extended states for such operators

Statistics and the dynamical localization for the point component

RANDOM MATRICES RELATED TO UNITARY GROUP

Leonid Pastur

University Paris 7

We present an overview of recent results on asymptotic behavior of eigenvalue distribution of random matrices of large order n , considering those random matrix ensembles whose probability law includes, as an independent factor, the

Haar measure on the unitary group U(n) We first discuss results on various forms of their limiting density of states, related to certain variational problems and to recent results in free probability. Then we outline results on the universality property of the local eigenvalue statistics, both in the bulk of the spectrum and at its generic edges. We mention also certain related facts of analysis and spectral theory.

SPECTRAL THEORY OF NONEQUILIBRIUM

STEADY STATES

Claude-Alain Pillet

University of Toulon

The algebraic approach to the dynamics of infinite quantum systems near thermal equilibrium naturally leads to the spectral theory of a self-adjoint operator that we called Liouvillean. Recent progresses on this subject have shown the usefulness of this concept. For systems driven out of thermal equilibrium by mechanical or thermodynamical forces, this method generally fails because even the existence of a steady state becomes problematic. I shall explain how to adapt the Liouvillean concept to this situation. As an illustration, I will discuss the existence of a steady state in a simple model: The N-level atom coupled to several reservoirs.

SCHROEDINGER OPERATORS WITH

DECAYING POTENTIALS

Christian Remling

Ludwig Maximmillians University

This talk deals with the spectral properties of one-dimensional Schroedinger operators with decaying potentials. I will try to give an overview, emphasizing

(some of) the more recent developments.

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10

KIRCHHOF'S RULE FOR QUANTUM WIRES

Robert Schrader

FU Berlin

We consider the quantum theory of a particle moving freely on a system of onedimensional wires (finite and half-infinite), which are connected in an arbitrary way at a finite set of vertices. We characterize all boundary conditions at the vertices which lead to local Kirchhof rules (=conservation of the quantum currents) at each vertex. The resulting on-shell scattering matrix, composed of the transmission and reflection amplitudes at the half-infinite ends, is given in closed form in terms of the boundary conditions, the lengths of the internal wires and the energy. The quantum version of Kirchhof's rule is now given as the unitarity of this on-shell S-matrix. Cutting the system into two leads to a composition rule for the corresponding S-matrices.

ON THE RENORMALIZATION OF THE ENERGY OF THE

ELECTRON-POSITRON FIELD

Heinz Siedentop

Universitaet Regensburg

In a joint work with E.H. Lieb, we consider the relativistic electron-positron field interacting with itself via the Coulomb potential defined with the physically motivated, positive, density-density quartic interaction. The more usual normalordered Hamiltonian differs from the bare Hamiltonian by a quadratic term and, by choosing the normal ordering in a suitable, self-consistent manner, the quadratic term can be seen to be equivalent to a renormalization of the Dirac operator. Formally, this amounts to a Bogolubov-Valatin transformation, but in reality it is non-perturbative, for it leads to an inequivalent, fine-structure dependent representation of the canonical anticommutation relations. This nonperturbative redefinition of the electron/positron states can be interpreted as a mass, wave-function and charge renormalization, among other possibilities, but the main point is that a non-perturbative definition of normal ordering might be a useful starting point for developing a consistent quantum electrodynamics.

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QUANTUM MECHANICS AT POSITIVE TEMPERATURES

Israel Michael Sigal

University of Toronto

In this talk I will review some recent results and open problems in nonequilibrium quantum statistical mechanics.

APPROACH TO EQUILIBRIUM IN A FORCED

BURGERS EQUATION

Barry Simon

California Institute of Technology

This describes joint work with W. Kirsch. We reduce approach to equilibrium for a forced Burgers equation to semigroup estimates for Schrodinger operators.

I'll discuss the proof of the necessary estimates for a periodic force and discuss a much more general conjecture.

THE CORRELATION ENERGY OF CHARGED QUANTUM SYSTEMS

Jan Philip Solovej

University of Copenhagen

Density functional theories have gained an enormous importance in computational chemistry and condensed matter physics. The credo of density functional theory is that the energy of a gas of charged particles is expressible in terms of the charge density only. Although this may be correct from a very abstract point of view the much more interesting fact is that the energy can indeed be well approximated by a fairly simple functional of the density. I will discuss some of what is known rigorously. In particular, I will discuss the simplest model, jellium, in which the density is nearly constant. I shall review what is known rigorously both for fermionic and for bosonic jellium. The result for bosonic jellium is recent joint work with E. Lieb.

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MULTI-SCALE ANALYSIS IMPLIES STRONG

DYNAMICAL LOCALIZATION

Peter Stollman

University of Frankfurt

We discuss and explain a recent joint result with D. Damanik concerning dynamical localization for random models.

THE BERNOULLI-ANDERSON MODEL

Gunter Stolz

University of Alabama at Birmingham

The Bernoulli-Anderson model is the most "singular" variant of the Anderson model, in the sense that the random coupling constants which define the potential take only two values. Coincidentally, this also makes it the most realistic model of alloys. Singular distributions cause various difficulties in determining spectral properties. As a result, localization for the Bernoulli-Anderson model has only been fully understood in the discrete, one-dimensional case, where two different approaches by Carmona/Klein/Martinelli and Shubin/Vakilian/Wolff, respectively, are known. In joint work with Damanik and Sims we show how ideas from scattering theory can be combined with the Carmona/Klein/Martinelli approach to prove localization (exponential and dynamical) for one-dimensional continuous Bernoulli-Anderson models with arbitrary compactly supported single-site potentials. The talk will also be used to point out some open problems.

QUENCHED AND ANNEALED RELATIONS FOR RANDOM WALKS

IN RANDOM ENVIRONMENTS

Ofer Zeitouni

Technion

Suppose that the integers are assigned i.i.d. random variables {

 x

} (taking values in the unit interval), which serve as an environment. This environment defines a random walk {

X

} (called a RWRE) which, when at x , moves one n step to the right with probability

, and one step to the left with probability x

1

  x

. Solomon (1975) determined the almost-sure asymptotic speed

v

(=rate of escape) of a RWRE. Subsequent work provided limit theorems for the

RWRE {

X

} . We describe recent results on the asymptotics of the probability n of rare events of the form where P ( X n

/ n

A )

P ( X

 n

  n

0

/ n

A ) or P

( X n

/ n

A ) , in the situation

). These are related to certain Lyapunov exponents, and the relation between quenched and annealed behaviour of these exponents will be described. Rather drastically different behaviour will then be described for RWRE on the (random) Galton-Watson tree.

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PARTICIPANTS’ ADDRESSES

Shmuel Agmon

Hebrew University of Jerusalem

Jerusalem, Israel

Michael Aizenmann

Department of Mathematics

Princton University agmon@math.huji.ac.il

Joachim Asch

Centre de Physique theorique

CNRS, Luminy Case 907

F-13288 Marseille Cedex 9

France

Asch@cpt.univ-mrs.fr

Jean-Marie Barbaroux

Laboratorie de Mathematiques

UMR 6629 du CNRS

Universite de Nantes

F-44322 Nantes Cedex 03

Jean-

Marie.Barbaroux@math.univnantes.fr

Olivier Bourget

Institut Fourier

BP74

38402 St. Martin D'Heres

France olivier.bourget@ujf-grenoble.fr

Princeton

USA

Aizenman@Princeton.EDU

Yosi Avron

Department of Physics

Technion

Haifa 32000

Israel

Avron@physics.technion.ac.il

Folkmar Bornemann

Center of Mathematical Sciences

Munich University of

Technology

D-80290 Muchich

German

Bornemann@mathematik.tumuenchen.de

Gregory Braverman

Max Planck Institute

Heidelberg

Greg@pluto.mpi-hd.mpg.de

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Almut Burchard

Department of Mathematics

PO Box 400137

Charlottesville, VA 22904-4137

USA ab4v@unix.mail.virginia.edu

Rafael Rene Del Rio Castillo

IRSAMC

Lab. Physique Quantique

UMR 5626

Universite Paul Sabatier

31062 Toulouse Cedex France delrio@irsamc2.ups-tlse.fr

Giovanni Gallavotti

Dipartimento di Fisica

University of Rome,

"La Sapienza"

P. Le Moro 2

00185 Rome, Italy giovanni@hilbert.rutgers.edu

Gian Michele Graf

Institute of Theoretical Physics

ETH Honggerberg, HPZ G 7

CH-8093 Zurich

Switzerland gmgraf@itp.phys.ethz.ch

David Damanik

Department of Mathematics

CalTech

Pasadena CA91125

USA damanik@its.caltech.edu

Alexander Figotin

Department of Mathematics

University of California at Irvine

Irvine, CA 92697, USA afigotin@math.uci.edu

Francois Germinet

Universite de Lille 1 (USTL)

UFR de Mathematiques

59655 Villeneuve d'Ascq

France

Francois.Germinet@agat.univlille1.fr

George Hagedorn

Department of Mathatics

460 McBryde Hall

Virginia Polytechnic Institute and

State University

Blacksburg, Virginia 24061-0123

USA hagedorn@calvin.math.vt.edu

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Bernard Helffer

Batiment 425

Departement de Mathematiques

Universite Paris Sud

91404 Orsay

France

Bernard.Helffer@math.u-psud.fr

Dirk Hundertmark

Department of Mathematics

CalTech

Pasadena CA91125

USA dirkh@caltech.edu

Svetlana Jitomirskaya

Department of Mathematics

University of California

Irvine, CA 92697

Yulia Karpechina

Department of Mathematics

University of Alabama at Birmingham

Birmingham, Al 35294-1170 karpeshi@vorteb.math.uab.edu

Peter Hislop

Mathematics Department

University of Kentucky

Lexington KY 40506-0027

USA

Hislop@ms.uky.edu

Victor Ivrii

Department of Mathetics

University of Toronto

100 St. George Str.

Toronto, Ontario M5S 3G3

Canada

Ivrii@math.toronto.edu

Alain Joye

Universite de Grenoble 1

Institut Fourier

B.P. 74

38402 Saint-Martin d'Heres

France

Alain.Joye@ujf-grenoble.fr

Rowan Killip

Department of Mathematics

California Institute of Technology

Pasadena CA 91125

USA

Killip@its.caltech.edu

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Werner Kirsch

Franz-Becker-Weg 12

D59494 Soest

Germany werner.kirsch@mathphys.ruhruni-bochum.de

Marcus Klein

Department of Mathematics

University of Potsdam mklein@math.uni-postdam.de

Frederic Klopp

Departement de Mathimatique

LAGA, Institut Galilie

Universiti Paris-Nord

F-93430 Villetaneuse

France klopp@math.univ-paris13.fr

Michael Landrigan

Department of Mathematics

University of California at Irvine

Irvine, CA 92697-3875

USA mlandrig@math.uci.edu

Alexander Kiselev

Department of Mathematics

University of Chicago

5734 S. University Ave.

Chicago Il 60637, USA kiselev@nutrimat.uchicago.edu

Abel Klein

Department of Mathematics

University of California at Irvine

Irvine CA 92697-3875 aklein@math.uci.edu

Peter Kuchment

Department of Mathematics

Wichita State University

Wichita, KS 67260-003

USA kuchment@twsuvm.uc.twsu.edu

Yoram Last

Department of Mathematics

Hebrew University of Jerusalem

Jerusalem

Israel ylast@math.huji.ac.il

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Daniel Lenz

Fachbereich Mathematik

J.W. Goethe Universitaet

60054 Frankfurt/Main

Germany dlenz@math.uni-frankfurt.de

Hatem Najar

Departement de Mathimatique

LAGA, Institut Galilie

Universiti Paris-Nord

F-93430 Villetaneuse

France najar@math.univ-paris13.fr

Leonid Pastur

Centre de Mathematiques de

Jussieu

Universite Paris 7 Denis Diderot

Case Postale 7012

F-75251 Paris Cedex o5, France pastur@cptpc23.univ-mrs.fr

Christian Remling

Mathematisches Institut

Ludwig Maximillians University

Theresienstr. 39

80333 Munich,

Germany remling@rz.mathematik. unimuenchen.de

Stanislav Molchanov

Mathematics Department

University of N. Carolina at Charlotte

Charlotte, NC 28223-0001

USA smolchan@uncc.edu

Katherine Naimark

Weizmann Institute of Science

Rehovot 76100

Israel

@weizmann.weizmann.ac.il

Claude-Alain Pillet

PHYMAT

Universite de Toulon

B.P. 132

F-83597 La Guarde Cedex

France pillet@cpt.univ-mrs.fr

Thomas Richter

Technische Universietaet Berlin

Fachbereich Mathematik

Sekr, MA7-2

Strase des 17 Juni 136

D-10623 Berlin, Germany thor@math.TU-Berlin.DE

14

Lorenzo Sadun

Department of Mathematics

University of Texas at Austin,

Austin TX 78712

USA sadun@physics.technion.ac.il

Robert Schrader

Institut fuer Theoretische Physik

Freie Universitaet Berlin

Arnimallee 14

14195 Berlin, Germany schrader@physik.fu-berlin.de

Zeev Rudnick

Department of Mathematics

Tel Aviv University

Ramat Aviv

Israel rudnick@math.tau.ac.il

Hermann Schulz-Baldes

University of California

Department of Mathematics

Irvine CA 92697-3875

USA schuba@math.uci.edu

Israel Michael Sigal

Department of Mathematics

University of Toronto

100 St. George Str.

Toronto, Ontario M5S 1A1

Canada sigal@ihes.fr

Ruedi Seiler

Technische Universitaet Berlin

Fachbereich Mathematik

Strasse des 17. Juni 136

D-10623 Berlin

Germany seiler@math.TU-Berlin.DE

Heinz Siedentop

Mathematik

Universitaet Muenchen

Theresienstr. 39

80333 Muenchen

Germany hkh@rz.mathematik.unimuenchen.de

Barry Simon

Mathematics Department

CalTech

Pasadena CA 91125

USA bsimon@bigfoot.com

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Uzy Smilansky

Physics Department

Weizmann Institute of Science

Rehovot 76100

Israel fnsmila1@wicc.weizmann.ac.il

Peter Stollmann

Department of Mathematics

University of Frankfurt

Robert-Mayer-Strasse 10

D-60325 Frankfurt am Main

Germany stollman@math.uni-frankfurt.de

Serguei Tcheremchantsev

University of Orleans

8 rue de la Gervaise

45470 Trainou

France

Serguei.Tcherem@labomath. univ-orleans.fr

Jan Philip Solovej

Department of Mathematics

University of Copenhagen

Universitetsparken 5

DK-2100 Copenhagen

Denmark solovej@math.ku.dk

Gunter Stolz

UAB Department of Physics

CH452

Birmingham AL35294-1170

USA stolz@vorteb.math.uab.edu

Ofer Zeitouni

Department of Mathematics

Technion

Haifa 32000

Israel zeitouni@ee.technion.ac.il

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