Detecting or Falsifying the Multiverse David Spergel Daan Meerburg.

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Presentation transcript:

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

*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 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 mother de Sitter space (aka the Multiverse)?

vs

*Vacuum from the Multiverse Potential signatures Requires development of new observational strategies/ estimators Use CMB, LSS to constrain potential signatures ? ?