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Title: Multiverse understanding of cosmological coincidences

Abstract

There is a deep cosmological mystery: although dependent on very different underlying physics, the time scales of structure formation, of galaxy cooling (both radiatively and against the CMB), and of vacuum domination do not differ by many orders of magnitude, but are all comparable to the present age of the universe. By scanning four landscape parameters simultaneously, we show that this quadruple coincidence is resolved. We assume only that the statistical distribution of parameter values in the multiverse grows towards certain catastrophic boundaries we identify, across which there are drastic regime changes. We find order-of-magnitude predictions for the cosmological constant, the primordial density contrast, the temperature at matter-radiation equality, the typical galaxy mass, and the age of the universe, in terms of the fine structure constant and the electron, proton and Planck masses. Our approach permits a systematic evaluation of measure proposals; with the causal patch measure, we find no runaway of the primordial density contrast and the cosmological constant to large values.

Authors:
; ;  [1]
  1. Center for Theoretical Physics, Department of Physics, University of California, Berkeley, California 94720-7300 (United States) and Lawrence Berkeley National Laboratory, Berkeley, California 94720-8162 (United States)
Publication Date:
OSTI Identifier:
21322684
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 80; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevD.80.063510; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGICAL CONSTANT; DENSITY; DISTRIBUTION; ELECTRONS; FINE STRUCTURE; FORECASTING; GALAXIES; MASS; PROTONS; RELICT RADIATION; UNIVERSE

Citation Formats

Bousso, Raphael, Hall, Lawrence J., and Nomura, Yasunori. Multiverse understanding of cosmological coincidences. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.80.063510.
Bousso, Raphael, Hall, Lawrence J., & Nomura, Yasunori. Multiverse understanding of cosmological coincidences. United States. doi:10.1103/PHYSREVD.80.063510.
Bousso, Raphael, Hall, Lawrence J., and Nomura, Yasunori. Tue . "Multiverse understanding of cosmological coincidences". United States. doi:10.1103/PHYSREVD.80.063510.
@article{osti_21322684,
title = {Multiverse understanding of cosmological coincidences},
author = {Bousso, Raphael and Hall, Lawrence J. and Nomura, Yasunori},
abstractNote = {There is a deep cosmological mystery: although dependent on very different underlying physics, the time scales of structure formation, of galaxy cooling (both radiatively and against the CMB), and of vacuum domination do not differ by many orders of magnitude, but are all comparable to the present age of the universe. By scanning four landscape parameters simultaneously, we show that this quadruple coincidence is resolved. We assume only that the statistical distribution of parameter values in the multiverse grows towards certain catastrophic boundaries we identify, across which there are drastic regime changes. We find order-of-magnitude predictions for the cosmological constant, the primordial density contrast, the temperature at matter-radiation equality, the typical galaxy mass, and the age of the universe, in terms of the fine structure constant and the electron, proton and Planck masses. Our approach permits a systematic evaluation of measure proposals; with the causal patch measure, we find no runaway of the primordial density contrast and the cosmological constant to large values.},
doi = {10.1103/PHYSREVD.80.063510},
journal = {Physical Review. D, Particles Fields},
number = 6,
volume = 80,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2009},
month = {Tue Sep 15 00:00:00 EDT 2009}
}