Oh no! More bad news for DM believers ...

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BeAChooser
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Joined: Thu Oct 15, 2015 2:24 am

Oh no! More bad news for DM believers ...

Unread post by BeAChooser » Thu Dec 01, 2022 9:29 pm

https://phys.org/news/2022-11-clustered ... -dark.html
Study rules out initially clustered primordial black holes as dark matter candidates

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Some theoretical physicists have been exploring the possibility that PBHs contribute significantly to the predicted abundance of dark matter in the universe, or in other words, that they are major dark matter candidates. Gravitational wave observations gathered by the LIGO-Virgo-KAGRA collaboration and constraints set by these observations suggest that this is highly unlikely.

Yet some recent studies suggested that the clustering of PBHs at the time of their formation could change their merger rate, which would potentially enable values within the constraints set by LIGO-Virgo-KAGRA. This clustering would also potentially affect existing microlensing bounds, as PBH clusters would act as a massive single lens that cannot be probed by microlensing studies.

Researchers at Université de Genève, Sapienza University of Rome and NICPB have recently carried out a theoretical study further assessing the hypothesis that initially clustered PBHs could be dark matter candidates. Their paper, published in Physical Review Letters, introduces a relatively simple argument that appears to rule out this possibility.

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