(H)ALPing the 511 keV line: A thermal DM interpretation of the 511 keV emission
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866915870217863168 |
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| author | Aghaie, Mohammad Luque, Pedro De la Torre Dondarini, Alessandro Gaggero, Daniele Marino, Giulio Panci, Paolo |
| author_facet | Aghaie, Mohammad Luque, Pedro De la Torre Dondarini, Alessandro Gaggero, Daniele Marino, Giulio Panci, Paolo |
| contents | We propose a novel framework where MeV-scale Dirac Dark Matter annihilates into axion-like particles, providing a natural explanation for the 511 keV gamma-ray line observed in the Galactic Center. The relic abundance is determined by p-wave annihilation into two axion-like particles, while s-wave annihilation into three axion-like particles, decaying into $e^+ e^-$ pairs, accounts for the line intensity. Remarkably, this model, assuming a standard Navarro-Frenk-White profile, reproduces the observed emission morphology, satisfies in-flight annihilation and cosmological bounds, and achieves the correct relic density, offering a compelling resolution to this longstanding anomaly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_10504 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | (H)ALPing the 511 keV line: A thermal DM interpretation of the 511 keV emission Aghaie, Mohammad Luque, Pedro De la Torre Dondarini, Alessandro Gaggero, Daniele Marino, Giulio Panci, Paolo High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena We propose a novel framework where MeV-scale Dirac Dark Matter annihilates into axion-like particles, providing a natural explanation for the 511 keV gamma-ray line observed in the Galactic Center. The relic abundance is determined by p-wave annihilation into two axion-like particles, while s-wave annihilation into three axion-like particles, decaying into $e^+ e^-$ pairs, accounts for the line intensity. Remarkably, this model, assuming a standard Navarro-Frenk-White profile, reproduces the observed emission morphology, satisfies in-flight annihilation and cosmological bounds, and achieves the correct relic density, offering a compelling resolution to this longstanding anomaly. |
| title | (H)ALPing the 511 keV line: A thermal DM interpretation of the 511 keV emission |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2501.10504 |