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Description
Feebly interacting dark matter (DM), produced via freeze-in or superWIMP mechanisms, is well known to imprint non-cold DM signatures on cosmological observables, as well as displaced signatures at colliders. In my talk, I will discuss how cosmology and particle physics experiments complementarily help to corner the viable parameter space of such candidates. I will also explore how a modification of early universe cosmology, with a low reheating temperature and a reheating period dominated by an equation of state different from radiation, might affect the overall picture.