Seminarium "Teoria cząstek elementarnych i kosmologia"

The freeze-in mechanism has become very popular over the past few years. One reason for this is its ability to explain the dark matter relic abundance with suppressed couplings, and thus evading (usually) all experimental constraints. However, the production of dark matter often is not treated carefully, and so some aspects of frozen-in relics are not pointed-out. In this talk, I will try to summarize some of the ways freeze-in can be different than one expects. I will show as generally as possible the effects of thermal masses, quantum statistics, and potential non-standard cosmological expansion on freeze-in.