Making dark matter out of light: freeze-in from plasma effects - INSPIRE

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Making dark matter out of light: freeze-in from plasma effects

Feb 22, 2019

20 pages

Published in:

Phys.Rev.D 99 (2019) 11, 115009,
Phys.Rev.D 105 (2022) 11, 119901 (erratum)

Published: Jun 11, 2019
and
Published: Jun 1, 2022

e-Print:

1902.08623 [hep-ph]

DOI:

10.1103/PhysRevD.99.115009 (publication),
10.1103/PhysRevD.105.119901 (erratum)

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Abstract: (APS)

Dark matter (DM) could couple to particles in the Standard Model (SM) through a light vector mediator. In the limit of small coupling, this portal could be responsible for producing the observed DM abundance through a mechanism known as freeze-in. Furthermore, the requisite DM-SM couplings provide a concrete benchmark for direct and indirect searches for DM. We present updated calculations of the relic abundance for DM produced by freeze-in through a light vector mediator. We identify an additional production channel: the decay of photons that acquire an in-medium plasma mass. These plasmon decays are a dominant channel for DM production for sub-MeV DM masses, and including this channel leads to a significant reduction in the predicted signal strength for DM searches. Accounting for production from both plasmon decays and annihilations of SM fermions, the DM acquires a highly nonthermal phase-space distribution which impacts the cosmology at later times; these cosmological effects will be explored in a companion paper.

Note:

23+8 pages, 8+1 figures

Beyond the standard model
neutrino: right-handed
neutrino: mass
current: right-handed
strong interaction: CP
CPT: violation
phase: CP
fermion: pair
dark matter
reheating

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