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

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  • Published: 10 October 2024
  • Volume 2024, article number 94, (2024)
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Searching accretion-enhanced dark matter annihilation signals in the Galactic Centre
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  • Meiwen Yang1,2,
  • Zhi-Qi Guo1,2,
  • Xiao-Yi Luo1,
  • Zhao-Qiang Shen  ORCID: orcid.org/0000-0003-3722-09662,
  • Zi-Qing Xia  ORCID: orcid.org/0000-0003-4963-72752,
  • Chih-Ting Lu  ORCID: orcid.org/0000-0002-9044-62971,
  • Yue-Lin Sming Tsai  ORCID: orcid.org/0000-0002-7275-85612,3 &
  • …
  • Yi-Zhong Fan  ORCID: orcid.org/0000-0002-8966-69112,3 

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A preprint version of the article is available at arXiv.

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

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Acknowledgments

We thank an anonymous referee for useful comments on gravitational potential. YST, MWY, ZQG and ZQX are supported by the National Key Research and Development Program of China (No. 2022YFF0503304), and the Project for Young Scientists in Basic Research of the Chinese Academy of Sciences (No. YSBR-092). CTL and XYL are supported by the Special funds for postdoctoral overseas recruitment, Ministry of Education of China (No. 164080H0262403). This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA’s Goddard Space Flight Center. This research has made use of the data resources from DArk Matter Particle Explorer (DAMPE) satellite mission supported by Strategic Priority Program on Space Science, and China data service provided by National Space Science Data Center of China.

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Authors and Affiliations

  1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, 210023, China

    Meiwen Yang, Zhi-Qi Guo, Xiao-Yi Luo & Chih-Ting Lu

  2. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210023, China

    Meiwen Yang, Zhi-Qi Guo, Zhao-Qiang Shen, Zi-Qing Xia, Yue-Lin Sming Tsai & Yi-Zhong Fan

  3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei, 230026, China

    Yue-Lin Sming Tsai & Yi-Zhong Fan

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Yang, M., Guo, ZQ., Luo, XY. et al. Searching accretion-enhanced dark matter annihilation signals in the Galactic Centre. J. High Energ. Phys. 2024, 94 (2024). https://doi.org/10.1007/JHEP10(2024)094

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  • Received: 20 July 2024

  • Accepted: 14 September 2024

  • Published: 10 October 2024

  • DOI: https://doi.org/10.1007/JHEP10(2024)094

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Keywords

  • Axions and ALPs
  • Particle Nature of Dark Matter
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