article · Journal of Cosmology and Astroparticle Physics · 2023

CMB and Lyman-α constraints on dark matter decays to photons

Francesco Capozzi, Ricardo Z. Ferreira, Laura Lopez-Honorez, Olga Mena

Cited by 24Open access

Abstract

Abstract Dark matter energy injection in the early universe modifies both the ionization history and the temperature of the intergalactic medium. In this work, we improve the CMB bounds on sub-keV dark matter and extend previous bounds from Lyman-α observations to the same mass range, resulting in new and competitive constraints on axion-like particles (ALPs) decaying into two photons. The limits depend on the underlying reionization history, here accounted self-consistently by our modified version of the publicly available DarkHistory and CLASS codes. Future measurements such as the ones from the CMB-S4 experiment may play a crucial, leading role in the search for this type of light dark matter candidates.

Cite this paper

APA 7

Capozzi, F., Ferreira, R. Z., Lopez-Honorez, L., & Mena, O. (2023). CMB and Lyman-α constraints on dark matter decays to photons. Journal of Cosmology and Astroparticle Physics, 2023(06), 060. https://doi.org/10.1088/1475-7516/2023/06/060

MLA 9

Capozzi, Francesco, et al. “CMB and Lyman-α constraints on dark matter decays to photons.” Journal of Cosmology and Astroparticle Physics, vol. 2023, no. 06, 2023, p. 060, https://doi.org/10.1088/1475-7516/2023/06/060.

Chicago

Capozzi, Francesco, Ricardo Z. Ferreira, Laura Lopez-Honorez, and Olga Mena. 2023. “CMB and Lyman-α constraints on dark matter decays to photons.” Journal of Cosmology and Astroparticle Physics 2023 (06): 060. https://doi.org/10.1088/1475-7516/2023/06/060.

Harvard

Capozzi, F. et al. (2023) ‘CMB and Lyman-α constraints on dark matter decays to photons’, Journal of Cosmology and Astroparticle Physics, 2023(06), p. 060. Available at: https://doi.org/10.1088/1475-7516/2023/06/060.

BibTeX

@article{capozzi2023lyman,
  title = {{CMB and Lyman-α constraints on dark matter decays to photons}},
  author = {Capozzi, Francesco and Ferreira, Ricardo Z. and Lopez-Honorez, Laura and Mena, Olga},
  journal = {Journal of Cosmology and Astroparticle Physics},
  volume = {2023},
  number = {06},
  pages = {060},
  year = {2023},
  doi = {10.1088/1475-7516/2023/06/060}
}

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