Daan Meerburg David Spergel Detecting or Falsifying the Multiverse
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?
We can measure the multiverse if: *Negative Curvature *Bubblecollisions *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
*BubbleCollisions 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 (akatheMultiverse)? This will depend on the ground state of the parent Universe (inaccessible spacetime) What determines the state ?
*Vacuum from the Multiverse Potential signatures ? ? Use CMB, LSS to constrain potential signatures Requires development of new observational strategies/ estimators