|
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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Fichiers attachés |
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