Reheating in two-sector cosmology

In this talk I describe scenarios where a hidden sector (HS) is directly populated by post-inflationary reheating along with the Standard Model (SM). Using numerical solutions of the appropriate Boltzmann equations describing perturbative reheating of the two sectors, I describe the role of quantum statistics and inflaton-mediated non-equilibrium energy transfer between the HS and SM in determining the temperature history. The resulting temperature ratio between the two sectors is a function of their couplings to the inflaton, and admits analytical approximations that allows the temperature ratios to be quickly estimated in a wide range of models. Additionally, I discuss how incorporating quantum statistics can lead to novel parametric behavior for radiation baths during perturbative reheating at temperatures large compared to the inflaton mass.