The distribution of Omega_k from the scale-factor cutoff measure

Details The distribution of Omega_k from the scale-factor cutoff measure The distribution of Omega_k from the scale-factor cutoff measure

2009-12-18

arxiv.org/abs/0912.3783v1

Phys.Rev.D81:083527,2010

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 7 figures

Scientific paper

10.1103/PhysRevD.81.083527

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 spacetime curvature. We study a recently proposed cartoon model of inflation in the landscape and find a reasonable chance (about ten percent) 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.

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