Statut | Confirmé |
Série | LPTHE-PPH |
Domaines | hep-ph |
Date | Vendredi 10 Novembre 2023 |
Heure | 14:00 |
Institut | LPTHE |
Salle | Library and Zoom (link in the comments) |
Nom de l'orateur | Chanda |
Prenom de l'orateur | Prolay |
Addresse email de l'orateur | pchand31 [at] uic [dot] edu |
Institution de l'orateur | University of Illinois at Chicago |
Titre | Improved Constraints on Dark Matter Annihilations Around Primordial Black Holes |
Résumé | Cosmology may give rise to appreciable populations of both particle dark matter and primordial black holes (PBH) with the combined mass density providing the observationally inferred value $\Omega_{\rm DM}\approx0.26$. However, previous studies have highlighted that scenarios with both particle dark matter and PBH are strongly excluded by $\gamma$-ray limits for particle dark matter with a velocity independent thermal cross section $\langle\sigma v\rangle\sim3\times10^{-26}{\rm cm}^3/{\rm s}$, as is the case for classic WIMP dark matter. Here we examine the limits from diffuse $\gamma$-rays on velocity-dependent, including annihilations which are $p$-wave with $\langle\sigma v \rangle\propto v^2$ or $d$-wave with $\langle\sigma v \rangle\propto v^4$, which we find to be considerably less constraining. Furthermore, we highlight that even if the freeze-out process is $p$- wave it is relatively common for (loop/phase-space) suppressed $s$-wave processes to actually provide the leading contributions to the experimentally constrained $\gamma$-ray flux from the PBH halo. This work also utilizes a refined treatment of the PBH dark matter density profile. |
Numéro de preprint arXiv | |
Commentaires | Zoom link: https://cern.zoom.us/j/65247099606?pwd=UU5ob3Q4a0hpakJvbk5KK01DSVpqUT09 |
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