Detecting or Falsifying the Multiverse David Spergel Daan Meerburg
Jan 03, 2016
Detecting or Falsifying the Multiverse
David Spergel
Daan Meerburg
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
We can measure the multiverse if:
*Negative Curvature
De Sitter Parent Universe
Emerging Universe needs to be Negatively curved
Improve constraints using multiple data sets: e.g. redshift-space distortions andCMB-lensing galaxy correlations
*Bubble Collisions
Stephen Feeney et al.
See e.g. Matthew Kleban’s group and talk
*Vacuum from the Multiverse
What determines the state ? This will depend on the ground state of the parent Universe (inaccessible spacetime)
Question?
Is there an observational difference between our Universe just being de Sitter or being a de Sitter bubble nucleated in a motherde Sitter space (aka the Multiverse)?
vs
*Vacuum from the MultiversePotential signatures
Requires development of new observational strategies/ estimators
Use CMB, LSS to constrain potential signatures
??