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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
??