Lyman-α constraints on freeze-in and superWIMPs
Quentin Decant (Brussels U.)

Dark matter (DM) from freeze-in or superWIMP production is well known to imprint non-cold DM signatures on cosmological observables.
It will be discussed how to derive constraints from Lyman-α forest observations for both cases, based on a reinterpretation of the existing Lyman-α limits on thermal warm DM.
Special emphasis is placed on the mixed scenario, where contributions from both freeze-in and superWIMP are similarly important. In this case, the imprint on cosmological observables can deviate significantly from thermal warm DM. The above will be illustrated by studying 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. The entire cosmologically viable parameter space, cornered by bounds from Lyman-α observations, the LHC, and Big Bang Nucleosynthesis, will be mapped.