Seminarium "Teoria cząstek elementarnych i kosmologia"

The Universe is typically assumed to be radiation-dominated in the period preceding big bang nucleosynthesis, however we do not currently have any observational probes confirming this. Nonstandard cosmological histories, where some other form of energy density dominates for a time, commonly arise in theories of the early Universe. These histories have important consequences for processes, such as dark matter production, occurring in that time. In this talk I will briefly review nonstandard cosmological histories and their effects on dark matter production focusing on axion dark matter.