Multi-component dark matter and Galactic 511 keV γ-ray emission
Abstract 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 pair...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-06-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2025)102 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849344304478158848 |
|---|---|
| author | Sarif Khan Jinsu Kim Jongkuk Kim Pyungwon Ko |
| author_facet | Sarif Khan Jinsu Kim Jongkuk Kim Pyungwon Ko |
| author_sort | Sarif Khan |
| collection | DOAJ |
| description | Abstract 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 | Article |
| id | doaj-art-e2f325f404ea4b2bbb7c17f7933b1be3 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-e2f325f404ea4b2bbb7c17f7933b1be32025-08-20T03:42:43ZengSpringerOpenJournal of High Energy Physics1029-84792025-06-012025613110.1007/JHEP06(2025)102Multi-component dark matter and Galactic 511 keV γ-ray emissionSarif Khan0Jinsu Kim1Jongkuk Kim2Pyungwon Ko3Institut für Theoretische Physik, Georg-August-Universität GöttingenSchool of Physics Science and Engineering, Tongji UniversityDepartment of Physics, Chung-Ang UniversitySchool of Physics, Korea Institute for Advanced StudyAbstract 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.https://doi.org/10.1007/JHEP06(2025)102Cosmology of Theories BSMModels for Dark MatterParticle Nature of Dark Matter |
| spellingShingle | Sarif Khan Jinsu Kim Jongkuk Kim Pyungwon Ko Multi-component dark matter and Galactic 511 keV γ-ray emission Journal of High Energy Physics Cosmology of Theories BSM Models for Dark Matter Particle Nature of Dark Matter |
| title | Multi-component dark matter and Galactic 511 keV γ-ray emission |
| title_full | Multi-component dark matter and Galactic 511 keV γ-ray emission |
| title_fullStr | Multi-component dark matter and Galactic 511 keV γ-ray emission |
| title_full_unstemmed | Multi-component dark matter and Galactic 511 keV γ-ray emission |
| title_short | Multi-component dark matter and Galactic 511 keV γ-ray emission |
| title_sort | multi component dark matter and galactic 511 kev γ ray emission |
| topic | Cosmology of Theories BSM Models for Dark Matter Particle Nature of Dark Matter |
| url | https://doi.org/10.1007/JHEP06(2025)102 |
| work_keys_str_mv | AT sarifkhan multicomponentdarkmatterandgalactic511kevgrayemission AT jinsukim multicomponentdarkmatterandgalactic511kevgrayemission AT jongkukkim multicomponentdarkmatterandgalactic511kevgrayemission AT pyungwonko multicomponentdarkmatterandgalactic511kevgrayemission |