Year: 2006
Type: article
Abstract: 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 ${m}_{\ensuremath{\chi}}$.
Authors: Graciela Gelmini, Paolo Gondolo
Institutions: University of California, Los Angeles, University of Utah
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2133129269