Dark Matter from Exponential Growth.

@article{Bringmann2021DarkMF,
  title={Dark Matter from Exponential Growth.},
  author={Torsten Bringmann and Paul Frederik Depta and Marco Hufnagel and Joshua T. Ruderman and Kai Schmidt-Hoberg},
  journal={Physical review letters},
  year={2021},
  volume={127 19},
  pages={
          191802
        }
}
We propose a novel mechanism for the production of dark matter (DM) from a thermal bath based on the idea that DM particles χ can transform heat bath particles ψ: χψ→χχ. For a small initial abundance of χ, 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… 

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Torsten Bringmann,1, 2, ∗ Paul Frederik Depta,3, † Marco Hufnagel,4, ‡ Jörn Kersten,5, 6, § Joshua T. Ruderman,7, ¶ and Kai Schmidt-Hoberg8, ∗∗ Department of Physics, University of Oslo, Box 1048,

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