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Axion constraints in nonstandard thermal histories

Grin, Daniel and Smith, Tristan L. and Kamionkowski, Marc (2008) Axion constraints in nonstandard thermal histories. Physical Review D, 77 (8). Art. No. 085020. ISSN 2470-0010.

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It 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 nonstandard 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 Trh<~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.

Item Type:Article
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Kamionkowski, Marc0000-0001-7018-2055
Additional Information:© 2008 The American Physical Society. (Received 8 November 2007; published 24 April 2008) D.G. was supported by the Gordon and Betty Moore Foundation and acknowledges helpful discussions with Mark Wise, Stefano Profumo, and Sean Tulin. T.L.S. and M.K. were supported by DOE No. DE-FG03-92-ER40701, NASA No. NNG05GF69G, and the Gordon and Betty Moore Foundation.
Group:TAPIR, Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Department of Energy (DOE)DE-FG03-92-ER40701
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:8
Record Number:CaltechAUTHORS:GRIprd08c
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10339
Deposited By: Archive Administrator
Deposited On:30 Apr 2008
Last Modified:03 Oct 2019 00:08

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