New Mass Window for Primordial Black Holes as Dark Matter from Memory Burden Effect
arxiv(2024)
摘要
The mass ranges allowed for Primordial Black Holes (PBHs) to constitute all
of Dark Matter (DM) are broadly constrained. However, these constraints rely on
the standard semiclassical approximation which assumes that the evaporation
process is self-similar. Quantum effects such as memory burden take the
evaporation process out of the semiclassical regime latest by half-decay time.
What happens beyond this time is currently not known. However, theoretical
evidence based on prototype models indicates that the evaporation slows down
thereby extending the lifetime of a black hole. This modifies the mass ranges
constrained, in particular, by BBN and CMB spectral distortions. We show that
previous constraints are largely relaxed when the PBH lifetime is extended,
making it possible for PBHs to constitute all of DM in previously excluded mass
ranges. In particular, this is the case for PBHs lighter than 10^9g which
enter the memory burden stage before BBN and are still present today as DM.
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