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Increasing the neutralino relic abundance with slepton coannihilations: consequences for indirect dark matter detection

Profumo, Stefano and Provenza, Alessio (2006) Increasing the neutralino relic abundance with slepton coannihilations: consequences for indirect dark matter detection. Journal of Cosmology and Astroparticle Physics, 2006 (12). Art. No. 019. ISSN 1475-7516. doi:10.1088/1475-7516/2006/12/019.

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We point out that if the lightest supersymmetric particle (LSP) is a higgsino- or wino-like neutralino, the net effect of coannihilations with sleptons is to increase the relic abundance, rather than producing the usual suppression, which takes place if the LSP is bino-like. The reason for the enhancement lies in the effective thermally averaged cross section at freeze-out: sleptons annihilate (and coannihilate) less efficiently than the neutralino(s)–chargino system, and therefore slepton coannihilations effectively act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic abundance of LSPs corresponds to the cold dark matter abundance for smaller values of the LSP mass, and larger values of the neutralino pair annihilation cross section. In turn, at a given thermal neutralino relic abundance, this implies larger indirect detection rates, as a result of an increase in the fluxes of antimatter, gamma rays and neutrinos from the Sun originating from neutralino pair annihilations.

Item Type:Article
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URLURL TypeDescription
Profumo, Stefano0000-0002-9159-7556
Additional Information:© Institute of Physics and IOP Publishing Limited 2006. Received 4 October 2006, accepted for publication 29 November 2006. Published 20 December 2006. We thank Piero Ullio for valuable discussions and suggestions. The work of SP was supported by the US Department of Energy grant numbers DE-FG03-92-ER40701 and FG02-05ER41361, and by NASA grant number NNG05GF69G. The work of AP was supported by the Italian INFN under the project ‘Fisica Astroparticellare’ and the MIUR PRIN ‘Fisica Astroparticellare’.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-92-ER40701
Department of Energy (DOE)DE-FG02-05ER41361
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)UNSPECIFIED
Subject Keywords:dark matter, cosmology of theories beyond the SM
Issue or Number:12
Record Number:CaltechAUTHORS:PROjcap06b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7174
Deposited By: Archive Administrator
Deposited On:13 Jan 2007
Last Modified:12 Jul 2022 19:42

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