Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric Model

Abstract

We consider non-standard cosmological models in which the late decay of a scalar field $\varphi$ reheats the Universe to a low reheating temperature, between 5 MeV and the standard freeze-out temperature of neutralinos of mass $m_{\chi }$. We point out that in these models all neutralinos with standard density ${\Omega }_{\mathrm{std}}\gtrsim 10^{-5}(100\mathrm{GeV}/m_{\chi })$ 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 $\varphi$ decay over the $\varphi$ field mass. We present the ranges of these parameters where a combination of thermal and non-thermal neutralino production leads to the desired density, as functions of ${\Omega }_{\mathrm{std}}$ and $m_{\chi }$.

4 pages, 1 figure

References in corpus (1)

• Moduli-Induced Gravitino Problem

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