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How open is the asteroid-mass primordial black hole window?

Gorton, Matthew; Green, Anne M.

How open is the asteroid-mass primordial black hole window? Thumbnail


Authors

Matthew Gorton



Abstract

Primordial black holes (PBHs) can make up all of the dark matter (DM) if their mass, m, is in the so-called “asteroid-mass window”, 10^{17} g ≲ m ≲ 10^{22} g1017g≲m≲1022g. Observational constraints on the abundance of PBHs are usually calculated assuming they all have the same mass, however this is unlikely to be a good approximation. PBHs formed from the collapse of large density perturbations during radiation domination are expected to have an extended mass function (MF), due to the effects of critical collapse. The PBH MF is often assumed to be lognormal, however it has recently been shown that other functions are a better fit to numerically calculated MFs. We recalculate both current and potential future constraints for these improved fitting functions. We find that for current constraints the asteroid-mass window narrows, but remains open (i.e. all of the DM can be in the form of PBHs) unless the PBH MF is wider than expected. Future evaporation and microlensing constraints may together exclude all of the DM being in PBHs, depending on the width of the PBH MF and also the shape of its low and high mass tails.

Citation

Gorton, M., & Green, A. M. (2024). How open is the asteroid-mass primordial black hole window?. SciPost Physics, 17(2), Article 032. https://doi.org/10.21468/SciPostPhys.17.2.032

Journal Article Type Article
Acceptance Date Jul 10, 2024
Online Publication Date Aug 2, 2024
Publication Date Aug 2, 2024
Deposit Date Aug 2, 2024
Publicly Available Date Aug 2, 2024
Journal SciPost Physics
Electronic ISSN 2542-4653
Publisher SciPost
Peer Reviewed Peer Reviewed
Volume 17
Issue 2
Article Number 032
DOI https://doi.org/10.21468/SciPostPhys.17.2.032
Public URL https://nottingham-repository.worktribe.com/output/37930338
Publisher URL https://scipost.org/10.21468/SciPostPhys.17.2.032

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