Entropy dilution from early matter domination reduces the couplings needed for multipolar dark matter to match the observed relic density, reopening regions excluded under radiation domination.
Anapole Dark Matter at the LHC
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abstract
The anapole moment is the only allowed electromagnetic moment for Majorana fermions. Fermionic dark matter acquiring an anapole can have a standard thermal history and be consistent with current direct detection experiments. In this paper, we calculate the collider monojet signatures of anapole dark matter and show that the current LHC results exclude anapole dark matter with mass less than 100 GeV, for an anapole coupling that leads to the correct thermal relic abundance.
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Multipolar Dark Matter Freeze-out in an Early Matter-Dominated Universe
Entropy dilution from early matter domination reduces the couplings needed for multipolar dark matter to match the observed relic density, reopening regions excluded under radiation domination.