Multi-component dark matter and Galactic 511 keV $γ$-ray emission

Fuente: arXiv
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Auteurs principaux: Khan, Sarif, Kim, Jinsu, Kim, Jongkuk, Ko, Pyungwon
Format: Preprint
Publié: 2024
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author Khan, Sarif
Kim, Jinsu
Kim, Jongkuk
Ko, Pyungwon
author_facet Khan, Sarif
Kim, Jinsu
Kim, Jongkuk
Ko, Pyungwon
contents We study multi-component dark matter scenarios and the Galactic 511 keV $γ$-ray emission line signal in the framework of a local, dark $U(1)_D$ extension of the Standard Model. A light vector dark matter particle associated with the dark $U(1)_D$ may decay and annihilate to electron-positron pairs. The produced positrons may in turn form positroniums that subsequently annihilate to two photons, accounting for the observed line signal of the Galactic 511 keV $γ$-ray emission. Three scenarios are investigated. First, we consider the minimal $U(1)_D$ extension where a dark gauge boson and a dark Higgs boson are newly introduced to the particle content. As a second scenario, we consider WIMP-type dark matter with the introduction of an extra dark fermion which, in addition to the dark gauge boson, may contribute to the dark matter relic abundance. It is thus a multi-component dark matter scenario with a UV-complete dark $U(1)_D$ symmetry. In particular, the vector dark matter may account for a small fraction of the total dark matter relic abundance. Finally, we consider the scenario where the dark matter particles are of the FIMP-type. In this case, both the light vector and fermion dark matter particles may be produced via the freeze-in and super-WIMP mechanisms. Considering theoretical and observational constraints, we explore the allowed parameter space where the Galactic 511 keV $γ$-ray line signal and the dark matter relic can both be explained. We also discuss possible observational signatures.
format Preprint
id arxiv_https___arxiv_org_abs_2409_07851
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Multi-component dark matter and Galactic 511 keV $γ$-ray emission
Khan, Sarif
Kim, Jinsu
Kim, Jongkuk
Ko, Pyungwon
High Energy Physics - Phenomenology
Cosmology and Nongalactic Astrophysics
We study multi-component dark matter scenarios and the Galactic 511 keV $γ$-ray emission line signal in the framework of a local, dark $U(1)_D$ extension of the Standard Model. A light vector dark matter particle associated with the dark $U(1)_D$ may decay and annihilate to electron-positron pairs. The produced positrons may in turn form positroniums that subsequently annihilate to two photons, accounting for the observed line signal of the Galactic 511 keV $γ$-ray emission. Three scenarios are investigated. First, we consider the minimal $U(1)_D$ extension where a dark gauge boson and a dark Higgs boson are newly introduced to the particle content. As a second scenario, we consider WIMP-type dark matter with the introduction of an extra dark fermion which, in addition to the dark gauge boson, may contribute to the dark matter relic abundance. It is thus a multi-component dark matter scenario with a UV-complete dark $U(1)_D$ symmetry. In particular, the vector dark matter may account for a small fraction of the total dark matter relic abundance. Finally, we consider the scenario where the dark matter particles are of the FIMP-type. In this case, both the light vector and fermion dark matter particles may be produced via the freeze-in and super-WIMP mechanisms. Considering theoretical and observational constraints, we explore the allowed parameter space where the Galactic 511 keV $γ$-ray line signal and the dark matter relic can both be explained. We also discuss possible observational signatures.
title Multi-component dark matter and Galactic 511 keV $γ$-ray emission
topic High Energy Physics - Phenomenology
Cosmology and Nongalactic Astrophysics
url https://arxiv.org/abs/2409.07851