Author:
Green Daniel,Guo Yi,Wallisch Benjamin
Abstract
Abstract
Axions and other light particles appear ubiquitously in
physics beyond the Standard Model, with a variety of possible
couplings to ordinary matter. Cosmology offers a unique probe of
these particles as they can thermalize in the hot environment of the
early universe for any such coupling. For sub-MeV particles, their
entropy must leave a measurable cosmological signal, usually via the
effective number of relativistic particles, N
eff. In this paper,
we will revisit the cosmological constraints on the couplings of
axions and other pseudo-Nambu-Goldstone bosons to Standard Model
fermions from thermalization below the electroweak scale, where
these couplings are marginal and give contributions to the radiation
density of ΔN
eff > 0.027. We update the calculation of the
production rates to eliminate unnecessary approximations and find
that the cosmological bounds on these interactions are complementary
to astrophysical constraints, e.g. from supernova SN 1987A. We
additionally provide quantitative explanations for these bounds and
their relationship.
Subject
Astronomy and Astrophysics
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