Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
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arXiv
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| Format: | Preprint |
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2024
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| author | Yang, MeiWen Guo, Zhi-Qi Luo, Xiao-Yi Shen, Zhao-Qiang Xia, Zi-Qing Lu, Chih-Ting Tsai, Yue-Lin Sming Fan, Yi-Zhong |
| author_facet | Yang, MeiWen Guo, Zhi-Qi Luo, Xiao-Yi Shen, Zhao-Qiang Xia, Zi-Qing Lu, Chih-Ting Tsai, Yue-Lin Sming Fan, Yi-Zhong |
| contents | This study reanalyzes the detection prospects of dark matter (DM) annihilation signals in the Galactic Center, focusing on velocity-dependent dynamics within a spike density near the supermassive black hole (Sgr~A$^{\star}$). We investigate three annihilation processes -- $p$-wave, resonance, and forbidden annihilation -- under semi-relativistic velocities, leveraging gamma-ray data from Fermi and DAMPE telescopes. Our analysis integrates a fermionic DM model with an electroweak axion-like particle (ALP) portal, exploring annihilation into two or four photons. Employing a comprehensive six-dimensional integration, we precisely calculate DM-induced gamma-ray fluxes near Sgr~A$^{\star}$, incorporating velocity and positional dependencies in the annihilation cross-section and photon yield spectra. Our findings highlight scenarios of resonance and forbidden annihilation, where the larger ALP-DM-DM coupling constant $C_{aχχ}$ can affect spike density, potentially yielding detectable gamma-ray line spectra within Fermi and DAMPE energy resolution. We set upper limits for $C_{aχχ}$ across these scenarios, offering insights into the detectability and spectral characteristics of DM annihilation signals from the Galactic Center. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06815 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre Yang, MeiWen Guo, Zhi-Qi Luo, Xiao-Yi Shen, Zhao-Qiang Xia, Zi-Qing Lu, Chih-Ting Tsai, Yue-Lin Sming Fan, Yi-Zhong High Energy Physics - Phenomenology High Energy Astrophysical Phenomena This study reanalyzes the detection prospects of dark matter (DM) annihilation signals in the Galactic Center, focusing on velocity-dependent dynamics within a spike density near the supermassive black hole (Sgr~A$^{\star}$). We investigate three annihilation processes -- $p$-wave, resonance, and forbidden annihilation -- under semi-relativistic velocities, leveraging gamma-ray data from Fermi and DAMPE telescopes. Our analysis integrates a fermionic DM model with an electroweak axion-like particle (ALP) portal, exploring annihilation into two or four photons. Employing a comprehensive six-dimensional integration, we precisely calculate DM-induced gamma-ray fluxes near Sgr~A$^{\star}$, incorporating velocity and positional dependencies in the annihilation cross-section and photon yield spectra. Our findings highlight scenarios of resonance and forbidden annihilation, where the larger ALP-DM-DM coupling constant $C_{aχχ}$ can affect spike density, potentially yielding detectable gamma-ray line spectra within Fermi and DAMPE energy resolution. We set upper limits for $C_{aχχ}$ across these scenarios, offering insights into the detectability and spectral characteristics of DM annihilation signals from the Galactic Center. |
| title | Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.06815 |