Dilaton Forbidden Dark Matter
arxiv(2024)
Abstract
Dilaton effective field theory (dEFT) describes the long distance behavior of
certain confining, near-conformal gauge theories that have been studied via
lattice computation. Pseudo-Nambu-Goldstone bosons (pNGBs), emerging from the
breaking of approximate, continuous, internal symmetries, are coupled to an
additional scalar particle, the dilaton, arising from the spontaneous breaking
of approximate scale invariance. This effective theory has been employed to
study possible extensions of the standard model. In this paper, we propose a
complementary role for dEFT, as a description of the dark matter of the
universe, with the pNGBs identified as the dark-matter particles. We show that
this theory provides a natural implementation of the “forbidden” dark matter
mechanism, and we identify regions of parameter space for which the thermal
history of dEFT yields the measured dark matter relic density.
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