Dimensionless constants, cosmology and other dark matters

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dc.creatorTegmark, Max
dc.creatorAguirre, Anthony
dc.creatorRees, Martin J
dc.creatorWilczek, Frank
dc.date2005-11-29
dc.date2006-01-11
dc.date.accessioned2026-07-07T11:25:00Z
dc.date.available2026-07-07T11:25:00Z
dc.descriptionWe identify 31 dimensionless physical constants required by particle physics and cosmology, and emphasize that both microphysical constraints and selection effects might help elucidate their origin. Axion cosmology provides an instructive example, in which these two kinds of arguments must both be taken into account, and work well together. If a Peccei-Quinn phase transition occurred before or during inflation, then the axion dark matter density will vary from place to place with a probability distribution. By calculating the net dark matter halo formation rate as a function of all four relevant cosmological parameters and assessing other constraints, we find that this probability distribution, computed at stable solar systems, is arguably peaked near the observed dark matter density. If cosmologically relevant WIMP dark matter is discovered, then one naturally expects comparable densities of WIMPs and axions, making it important to follow up with precision measurements to determine whether WIMPs account for all of the dark matter or merely part of it.
dc.description29 pages, 13 figs, minor mods to match published PRD version
dc.identifierhttps://arxiv.org/abs/astro-ph/0511774
dc.identifierhttp://arxiv.org/abs/astro-ph/0511774
dc.identifierPhys.Rev.D73:023505,2006
dc.identifierdoi:10.1103/PhysRevD.73.023505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195381
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleDimensionless constants, cosmology and other dark matters
dc.typetext

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