Papers › CMB and Lyman-α constraints on dark matter decays to photons
CMB and Lyman-α constraints on dark matter decays to photons
Francesco Capozzi, Ricardo Z. Ferreira, Laura Lopez-Honorez, Olga Mena
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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 {\tt DarkHistory} and {\tt 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.
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