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Cosmological axino problem

Cheung, Clifford and Elor, Gilly and Hall, Lawrence J. (2012) Cosmological axino problem. Physical Review D, 85 (1). Art. No. 015008. ISSN 1550-7998. doi:10.1103/physrevd.85.015008.

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We revisit the cosmology of the supersymmetric QCD axion, highlighting the existence of a serious cosmological axino problem that is fully analogous to the gravitino problem of overclosure via thermal production. A general analysis implies that the QCD axino has a mass greater than or equal to that of the gravitino in the absence of unnatural fine-tuning or sequestering. As a consequence, bounds from thermal gravitino and QCD axino production are complementary in parameter space, and together provide a quite stringent limit on the reheating temperature after inflation given by T_R < 10^3 − 10^6 GeV for an axion decay constant of f_a = 10^9 − 10^(12) GeV. Motivated by this result, we explore the cosmology of gravitino lightest supersymmetric particle and axino next to lightest supersymmetric particle at low T_R and present three realistic scenarios for dark matter.

Item Type:Article
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URLURL TypeDescription Paper
Alternate Title:The Cosmological Axino Problem
Additional Information:© 2012 American Physical Society. (Received 28 June 2011; published 18 January 2012) We thank Mina Arvanitaki, Kiwoon Choi, and Peter Graham for useful discussions. This work was supported in part by the Director, Office of Science, Office of High Energy and Nuclear Physics, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and by the National Science Foundation under Grant No. PHY-0457315.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-05CH11231
Issue or Number:1
Classification Code:PACS numbers: 95.35.+d, 14.80.Ly
Record Number:CaltechAUTHORS:20190619-094158169
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96531
Deposited By: George Porter
Deposited On:19 Jun 2019 23:19
Last Modified:16 Nov 2021 17:21

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