Reheating in the kination epoch via multichannel decay of gravitationally created massive scalars

We provide a detailed study of reheating in the kination regime in a scenario where the particle content is produced by gravitational production of massive scalars decaying into massless scalars and fermions which eventually reheat the Universe. A detailed calculation is given by using Boltzmann equations and decay rates obtained using formalism of quantum field theory in curved spacetime. By numerical calculations the reheating temperature is found to be in the 10(9)-10(13) GeV regime. Moreover, the fermionic channel of decay is found to be the dominant channel of decay when the mass m of the decaying particle is small raising the reheating temperature as opposed to a single scalar decay channel.

Automated summary

A detailed study of reheating in the kination regime is conducted, where particles are produced through gravitational production of massive scalars decaying into massless scalars and fermions. Numerical calculations reveal a reheating temperature in the range of 10^9 - 10^13 GeV, with the fermionic decay channel being the dominant channel when the mass of the decaying particle is small.