David
Spergel
Daan
Meerburg
Detecting or Falsifying the
Is our
observational
Universe unique
or is it part of a
much larger
multiverse?
What are the possible
signatures in our
observable Universe
and how should the
signatures be optimally
extracted from the data?
*Negative Curvature
*Bubble collisions
*Vacuum from the
Multiverse
*Negative Curvature
De Sitter Parent Universe
Emerging Universe needs to be Negatively curved
Improve constraints using multiple data sets: e.g. redshift-space distortions and
CMB-lensing galaxy correlations
*Bubble Collisions
Stephen Feeney et al.
See e.g. Matthew Kleban’s group and talk
*Vacuum from the Multiverse
Question?
Is there an observational
difference between our
Universe just being de
Sitter or being a de Sitter
bubble nucleated in a
mother
de Sitter space (aka the
Multiverse)?
What determines the state
?This will depend on the ground state of the
parent Universe (inaccessible spacetime)
vs
*Vacuum from the
Potential signatures
Multiverse
?
?
Use CMB, LSS to constrain potential signatures
Requires development of new observational strategies/ estimators