Axion constraints in non-standard thermal histories

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dc.creatorGrin, Daniel
dc.creatorSmith, Tristan L.
dc.creatorKamionkowski, Marc
dc.date2007-11-08
dc.date2008-05-25
dc.date.accessioned2026-07-07T11:54:05Z
dc.date.available2026-07-07T11:54:05Z
dc.descriptionIt is usually assumed that dark matter is produced during the radiation dominated era. There is, however, no direct evidence for radiation domination prior to big-bang nucleosynthesis. Two non-standard thermal histories are considered. In one, the low-temperature-reheating scenario, radiation domination begins as late as 1 MeV, and is preceded by significant entropy generation. Thermal axion relic abundances are then suppressed, and cosmological limits to axions are loosened. For reheating temperatures less than 35 MeV, the large-scale structure limit to the axion mass is lifted. The remaining constraint from the total density of matter is significantly relaxed. Constraints are also relaxed for higher reheating temperatures. In a kination scenario, a more modest change to cosmological axion constraints is obtained. Future possible constraints to axions and low-temperature reheating from the helium abundance and next-generation large-scale-structure surveys are discussed.
dc.description10 pages, 7 figures, revised to match version published in Phys. Rev. D. Fig. 7 and Eq. (20) modified
dc.identifierhttps://arxiv.org/abs/0711.1352
dc.identifierhttp://arxiv.org/abs/0711.1352
dc.identifierPhys.Rev.D77:085020,2008
dc.identifierdoi:10.1103/PhysRevD.77.085020
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/204769
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAxion constraints in non-standard thermal histories
dc.typetext

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