Searching accretion-enhanced dark matter annihilation signals in the Galactic Centre

A bstract 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 ⋆ ). We investigate three annihilation processes — p -wave, resonance, and f...

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Bibliographic Details
Published in:The journal of high energy physics 2024-10, Vol.2024 (10), p.94-33, Article 94
Main Authors: Yang, Meiwen, Guo, Zhi-Qi, Luo, Xiao-Yi, Shen, Zhao-Qiang, Xia, Zi-Qing, Lu, Chih-Ting, Tsai, Yue-Lin Sming, Fan, Yi-Zhong
Format: Article
Language:English
Subjects:
Axions and ALPs
Classical and Quantum Gravitation
Dark matter
Density
Elementary Particles
Energy resolution
Gamma rays
Line spectra
P waves
Particle Nature of Dark Matter
Particle telescopes
Photons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativistic velocity
Relativity Theory
Resonance
String Theory
Supermassive black holes
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Summary:A bstract 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 ⋆ ). 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 ⋆ , 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.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP10(2024)094