PT Journal
AU Capozzi, F
   Ferreira, RZ
   Lopez-Honorez, L
   Mena, O
TI CMB and Lyman-alpha constraints on dark matter decays to photons
SO Journal of Cosmology and Astroparticle Physics
JI J. Cosmol. Astropart. Phys.
PY 2023
BP 060
EP 23pp
VL 06
IS 6
DI 10.1088/1475-7516/2023/06/060
LA English
DE reionization; axions; cosmological parameters from CMBR; dark matter theory
AB 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-& alpha; 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.
ER