Distribution of Ohm k from the scale-factor cutoff measure
Author(s)De Simone, Andrea; Salem, Michael P.
Distribution of Ωk from the scale-factor cutoff measure
MetadataShow full item record
Our Universe may be contained in one among a diverging number of bubbles that nucleate within an eternally inflating multiverse. A promising measure to regulate the diverging spacetime volume of such a multiverse is the scale-factor cutoff, one feature of which is bubbles are not rewarded for having a longer duration of slow-roll inflation. Thus, depending on the landscape distribution of the number of e-folds of inflation among bubbles like ours, we might hope to measure spatial curvature. We study a recently proposed cartoon model of inflation in the landscape and find a reasonable chance (about 10%) that the curvature in our Universe is well above the value expected from cosmic variance. Anthropic selection does not strongly select for curvature as small as is observed (relative somewhat larger values), meaning the observational bound on curvature can be used to rule out landscape models that typically give too little inflation.
DepartmentMassachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics
Physical Review D
American Physical Society
De Simone, Andrea, and Michael P. Salem. "Distribution of Ωk from the scale-factor cutoff measure." Physical Review D 81.8 (2010): 083527. © 2010 The American Physical Society.
Final published version