| Issue |
EPJ Web Conf.
Volume 319, 2025
RICAP-24, 9th Roma International Conference on Astroparticle Physics
|
|
|---|---|---|
| Article Number | 03001 | |
| Number of page(s) | 8 | |
| Section | Plenary Sessions Sept. 26th | |
| DOI | https://doi.org/10.1051/epjconf/202531903001 | |
| Published online | 06 March 2025 | |
https://doi.org/10.1051/epjconf/202531903001
Early clustering of DM particles around PBHs Density profiles and signatures
1 Université Grenoble Alpes, USMB, CNRS, LAPTh, 9 chemin de Bellevue, Annecy-le-Vieux, F-74941 Annecy, France
2 Laboratoire Univers et Particules de Montpellier (LUPM), Université de Montpellier & CNRS, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France
* e-mail: pierre.salati@lapth.cnrs.fr
** e-mail: lavalle@in2p3.fr
Published online: 6 March 2025
Primordial black holes may have been produced in the early stages of the universe, after cosmic inflation. If so, dark matter in the form of elementary particles can be subsequently accreted around these objects, in particular when it gets non-relativistic and further streams freely in the primordial plasma. A dark matter mini-spike builds up gradually around each black hole during the radiation dominated era, with density orders of magnitude larger than the cosmological one. The radial profiles of mini-spikes depend sensitively on black hole mass, dark matter particle mass and temperature of kinetic decoupling. They exhibit a rich variety of behaviors which are presented here. These spikes subsequently annihilate and leave potentially detectable signatures in the extragalactic γ-ray background and in the cosmic microwave background.
© The Authors, published by EDP Sciences, 2025
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