Cosmological evolution of thermal relic particles in $f(R)$ gravity

TL;DR

This paper investigates how $f(R)$ gravity models alter the thermal relic particle evolution, such as WIMPs, within cosmology, considering observational constraints and implications for experiments like PAMELA, BICEP2, and PLANCK.

Contribution

It derives the evolution of relic particles in $f(R)$ gravity models, integrating observational constraints and linking to experimental data.

Findings

Relic particle evolution is modified under $f(R)$ gravity.

Results align with BICEP2 and PLANCK observational constraints.

Discussion includes potential implications for PAMELA experiment data.

Abstract

By considering $f(R)$ gravity models, the cosmic evolution is modified with respect to the standard $\Lambda$CDM scenario. In particular, the thermal history of particles results modified. In this paper, we derive the evolution of relics particles (WIMPs) assuming a reliable $f(R)$ cosmological solution and taking into account observational constraints. The connection to the PAMELA experiment is also discussed. Results are consistent with constraints coming from BICEP2 and PLANCK experiments.