Synchrotron Self-Compton Process for Constraining sub-GeV Dark Matter in Omega Centauri via SKA
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910016646152192 |
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| author | Wang, Guan-Sen Su, Bing-Yu Yu, Yang Zhang, Bo Feng, Lei |
| author_facet | Wang, Guan-Sen Su, Bing-Yu Yu, Yang Zhang, Bo Feng, Lei |
| contents | The search for the particle identity of dark matter (DM) continues to be a primary objective in modern physics. In this field, the sub-GeV mass range of DM detection remains a crucial yet challenging window. We investigate synchrotron self-Compton (SSC) emission from electrons and positrons produced by MeV-scale DM annihilation as a novel indirect detection channel. Focusing on the globular cluster Omega Centauri and the sensitivity of the Square Kilometre Array, we derive constraints on the annihilation cross section reaching $\langleσv\rangle \sim 10^{-30}\,\rm{cm}^{3}\,\rm{s}^{-1}$ in the tens-of-MeV range. Furthermore, constraints could even reach below $\langleσv\rangle \sim 10^{-32}\,\rm{cm}^{3}\,\rm{s}^{-1}$ for extreme parameter choices. Remarkably, even under deliberately conservative astrophysical assumptions, this channel outperforms existing indirect limits, establishing SSC emission as a robust probe of sub-GeV DM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08731 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Synchrotron Self-Compton Process for Constraining sub-GeV Dark Matter in Omega Centauri via SKA Wang, Guan-Sen Su, Bing-Yu Yu, Yang Zhang, Bo Feng, Lei Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology The search for the particle identity of dark matter (DM) continues to be a primary objective in modern physics. In this field, the sub-GeV mass range of DM detection remains a crucial yet challenging window. We investigate synchrotron self-Compton (SSC) emission from electrons and positrons produced by MeV-scale DM annihilation as a novel indirect detection channel. Focusing on the globular cluster Omega Centauri and the sensitivity of the Square Kilometre Array, we derive constraints on the annihilation cross section reaching $\langleσv\rangle \sim 10^{-30}\,\rm{cm}^{3}\,\rm{s}^{-1}$ in the tens-of-MeV range. Furthermore, constraints could even reach below $\langleσv\rangle \sim 10^{-32}\,\rm{cm}^{3}\,\rm{s}^{-1}$ for extreme parameter choices. Remarkably, even under deliberately conservative astrophysical assumptions, this channel outperforms existing indirect limits, establishing SSC emission as a robust probe of sub-GeV DM. |
| title | Synchrotron Self-Compton Process for Constraining sub-GeV Dark Matter in Omega Centauri via SKA |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2602.08731 |