A Geometric Solution to the Coincidence Problem, and the Size of the Landscape as the Origin of Hierarchy
Name
Bousso-2011-A Geometric Solution.pdf
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Author(s)
Bousso, Raphael
Freivogel, Benjamin W.
Leichenauer, Stefan
Rosenhaus, Vladimir
Date Issued
March 2011
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Bousso, Raphael et al. “A Geometric Solution to the Coincidence Problem, and the Size of the Landscape as the Origin of Hierarchy.” Physical Review Letters 106 (2011). © 2011 American Physical Society.
Version
Final published version
Abstract
Weinberg’s seminal prediction of the cosmological constant relied on a provisional method for regulating eternal inflation which has since been put aside. We show that a modern regulator, the causal patch, improves agreement with observation, removes many limiting assumptions, and yields additional powerful results. Without assuming necessary conditions for observers such as galaxies or entropy production, the causal patch measure predicts the coincidence of vacuum energy and present matter density. Their common scale, and thus the enormous size of the visible Universe, originates in the number of metastable vacua in the landscape.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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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/PhysRevLett.106.101301
