Neutralino Relic Density Enhancement in Non-Standard Cosmologies

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dc.creatorProfumo, Stefano
dc.creatorUllio, Piero
dc.date2004-04-20
dc.date.accessioned2026-07-07T02:12:56Z
dc.date.available2026-07-07T02:12:56Z
dc.descriptionThe thermal relic abundance of species critically depends on the assumed underlying cosmological model. In the case of neutralinos, freeze-out takes place long before Big Bang Nucleosynthesis, which provides the strongest constraint on the evolution of the Hubble parameter in the Early Universe. We show that non-standard cosmologies, such as models featuring a quintessential scalar field or primordial anisotropies, can lead to large enhancements in the neutralino relic abundance, up to six orders of magnitudes. Within these scenarios, supersymmetric models with large neutralino annihilation cross sections may account for the whole inferred amount of cold dark matter, yielding on the other hand large indirect detection rates.
dc.description4 pages, 4 figures; Talk presented by S.Profumo at the XXXIXth Rencontres de Moriond on "Exploring the Universe", La Thuile, Italy, March 28 - April 4, 2004
dc.identifierhttps://arxiv.org/abs/astro-ph/0404390
dc.identifierhttp://arxiv.org/abs/astro-ph/0404390
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/7638
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNeutralino Relic Density Enhancement in Non-Standard Cosmologies
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