Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre

Abstract

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 $C_{a\chi \chi }$ can affect spike density, potentially yielding detectable gamma-ray line spectra within Fermi and DAMPE energy resolution. We set upper limits for $C_{a\chi \chi }$ across these scenarios, offering insights into the detectability and spectral characteristics of DM annihilation signals from the Galactic Center.

arXiv comment24 pages, 13 figures

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• Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess
• Axion-Like Particle Mediated Dark Matter and Neutron Star Properties in the QHD Model
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• The calibrations of DAMPE $\gamma$-ray effective area
• Fermionic Dark Matter spikes: origin and growth of Black Hole seeds