Speaker
Description
Dark matter (DM) from freeze-in or superWIMP production is well known to imprint non-cold DM signatures on cosmological observables. We derive constraints from Lyman-α forest
observations for both cases, basing ourselves on a reinterpretation of the existing Lyman-α limits
on thermal warm DM. We exclude DM masses below 15 keV for freeze-in, in good agreement
with previous literature, and provide a generic lower mass bound for superWIMPs that depends
on the mother particle decay width. For illustration, we apply the above generic limits to a
coloured t-channel mediator DM model, in which case contributions from both freeze-in through
scatterings and decays, as well as superWIMP production can be important. We map out the
entire cosmologically viable parameter space, cornered by bounds from Lyman-α observations,
the LHC, and Big Bang Nucleosynthesis.
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