Rates of particle production in $R^2$ gravity and supersymmetry-kind dark matter

TL;DR

This paper investigates particle production in $R^2$ gravity, analyzing how scalaron decay influences the formation of supersymmetry-like dark matter, revealing wider viable mass ranges for such particles.

Contribution

It introduces calculations of particle production rates in $R^2$ gravity and explores how scalaron decay modes affect dark matter mass bounds, expanding the parameter space for supersymmetry-like dark matter.

Findings

Scalaron decay channels significantly impact dark matter mass bounds.

Wider mass windows for supersymmetry-like dark matter are possible.

Results depend on the dominant decay mode of the scalaron.

Abstract

Universe heating in $R^2$-modified gravity is considered. The rates of particle production by the scalaron are calculated for different decay channels. Freezing of massive stable relics with the interaction strength typical for supersymmetry is studied. It is shown that the bounds on masses of supersymmetry-kind particles allowing them to form the cosmological dark matter (DM)depend upon the dominant decay mode of the scalaron. In any case the results presented open much wider mass window for DM with the interaction strength typical for supersymmetry.