Black hole remnants are not too fast to be dark matter. (arXiv:2105.01627v2 [gr-qc] UPDATED)
<a href="http://arxiv.org/find/gr-qc/1/au:+Lehmann_B/0/1/0/all/0/1">Benjamin V. Lehmann</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Profumo_S/0/1/0/all/0/1">Stefano Profumo</a>
We comment on recent claims that recoil in the final stages of Hawking
evaporation gives black hole remnants large velocities, rendering them inviable
as a dark matter candidate. We point out that due to cosmic expansion, such
large velocities at the final stages of evaporation are not in tension with the
cold dark matter paradigm so long as they are attained at sufficiently early
times. In particular, the predicted recoil velocities are robustly compatible
with observations if the remnants form before the epoch of big bang
nucleosynthesis, a requirement which is already imposed by the physics of
nucleosynthesis itself.
We comment on recent claims that recoil in the final stages of Hawking
evaporation gives black hole remnants large velocities, rendering them inviable
as a dark matter candidate. We point out that due to cosmic expansion, such
large velocities at the final stages of evaporation are not in tension with the
cold dark matter paradigm so long as they are attained at sufficiently early
times. In particular, the predicted recoil velocities are robustly compatible
with observations if the remnants form before the epoch of big bang
nucleosynthesis, a requirement which is already imposed by the physics of
nucleosynthesis itself.
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