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arXiv · 2103.16572

Dark Matter from Exponential Growth

Torsten Bringmann·Paul Frederik Depta·Marco Hufnagel·Joshua T. Ruderman·Kai Schmidt-Hoberg
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Abstract

We propose a novel mechanism for the production of dark matter (DM) from a thermal bath, based on the idea that DM particles $\chi$ can transform heat bath particles $\psi$: $\chi \psi \rightarrow \chi \chi$. For a small initial abundance of $\chi$ this leads to an exponential growth of the DM number density, in close analogy to other familiar exponential growth processes in nature. We demonstrate that this mechanism complements freeze-in and freeze-out production in a generic way, opening new parameter space to explain the observed DM abundance, and we discuss observational prospects for such scenarios.

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Torsten Bringmann, Paul Frederik Depta, Marco Hufnagel, Joshua T. Ruderman, Kai Schmidt-Hoberg. 2021-03-30. Dark Matter from Exponential Growth. https://doi.org/10.1103/physrevlett.127.191802

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