Abstract
Decaying or annihilating dark matter and other exotic energy injections can
modify the spectrum of the universe's photon bath, resulting in e.g. new
contributions to spectral distortions of the cosmic microwave background
blackbody spectrum and modifications to the temperature and ionization history
of the universe. Here, we present an improved version of the
$DarkHistory$ code, which is now capable of consistently calculating
the spectrum of low-energy photons by properly treating the interactions of
these photons with the levels of hydrogen atoms. Other changes to the code
include a more detailed treatment of energy deposition by low-energy electrons,
and spectral distortions from heating of the intergalactic medium. All of the
improvements we have made to $DarkHistory$ are publicly available.
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