Distribution of Ohm k from the scale-factor cutoff measure
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De Simone-2010-Distribution of Omeg.pdf
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Author(s)
De Simone, Andrea
Salem, Michael P.
Alternative Title
Distribution of Ωk from the scale-factor cutoff measure
Date Issued
April 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
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.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.083527
