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arXiv · 2303.07372

Dark matter from hot big bang black holes

Avi Friedlander·Ningqiang Song·Aaron C. Vincent
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Abstract

If the temperature of the hot thermal plasma in the Early Universe was within a few orders of magnitude of the Planck scale $M_{\rm Pl}$, then the hoop conjecture predicts the formation of microscopic black holes from particle collisions in the plasma. Although these evaporated instantly, they would have left behind a relic abundance of all stable degrees of freedom which couple to gravity. Here we show that, upon minimal assumptions of a high reheat temperature and semiclassical black hole dynamics, this process could have produced the relic abundance of dark matter observed today for a particle mass anywhere in the range of $100~\mathrm{keV} \lesssim m_{dm} < M_{\rm Pl}$, though it could be subdominant to graviton-mediated freeze-in above $m_{dm} \sim$ MeV. The production mechanism does not rely on any additional assumptions about non-gravitational dark matter-Standard Model interaction.

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Avi Friedlander, Ningqiang Song, Aaron C. Vincent. 2023-03-13. Dark matter from hot big bang black holes. https://arxiv.org/abs/2303.07372

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