Neutralino with the right cold dark matter abundance in (almost) any supersymmetric model

By G. Gelmini, P. Gondolo. 2006

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We consider nonstandard cosmological models in which the late decay of a scalar field $\ensuremath{\phi}$ reheats the Universe to a low reheating temperature, between 5 MeV and the standard freeze-out temperature of neutralinos of mass ${m}_{\ensuremath{\chi}}$. We point out that in these models all neutralinos with standard density ${\ensuremath{\Omega}}_{\mathrm{std}}\ensuremath{\gtrsim}{10}^{\ensuremath{-}5}(100\text{ }\text{ }\mathrm{GeV}/{m}_{\ensuremath{\chi}})$ can have the density of cold dark matter, provided the right combination of the following two parameters can be achieved in the high-energy theory: the reheating temperature, and the ratio of the number of neutralinos produced per $\ensuremath{\phi}$ decay over the $\ensuremath{\phi}$ field mass. We present the ranges of these parameters where a combination of thermal and nonthermal neutralino production leads to the desired density, as functions of ${\ensuremath{\Omega}}_{\mathrm{std}}$ and ${m}_{\ensuremath{\chi}}$.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/610e9d9ccd088452ed98a7c4a8508aaf971d67fb

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Citations in the corpus

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Gravitational production of vector dark matter (2020, unknown): “[37–42], however we neglect such effects here.”
Dark matter and the early Universe: A review (2021, background): “• Its decay injects radiation entropy, which alters the relation between time and temperature, leading to a decrease of the relic density [59, 165].”