A Geometric Solution to the Coincidence Problem, and the Size of the Landscape as the Origin of Hierarchy
Author(s)
Bousso, Raphael; Freivogel, Benjamin W.; Leichenauer, Stefan; Rosenhaus, Vladimir
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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.
Date issued
2011-03Department
Massachusetts Institute of Technology. Center for Theoretical Physics; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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
ISSN
0031-9007