Non-thermalized dark matter is a cosmologically valid alternative to the paradigm of weakly interacting massive particles. For dark matter belonging to a $Z_2$-odd sector that also contains a thermalized mediator particle, dark-matter production proceeds via both the freeze-in and super-WIMP mechanism. We highlight their interplay and study the evolution of the resulting dark-matter phase-space distributions in detail. Utilizing our implementation into CLASS, we investigate their cosmological imprints on the matter power spectrum, constrained, in particular, by Lyman-alpha forest observations. For the explicit example of a colored t-channel mediator model, we map out the entire cosmologically viable parameter space, cornered by bounds from the LHC, big bang nucleosynthesis, and the matter power spectrum on small scales.
|First author||Jan Heisig|
|Collaboration / Activity||none|