Stochastic background of gravitational waves "tuned" by $f(R)$ gravity

TL;DR

This paper explores how extended theories of gravity, specifically $f(R)$ models, can influence the evolution and production of the cosmological gravitational wave background, offering a parametric control mechanism.

Contribution

It introduces a parametric approach to tune the cosmological gravitational wave background using generic $f(R)$ gravity models, linking gravity modifications to gravitational wave production.

Findings

$f(R)$ gravity can modify gravitational wave spectra.

The approach provides a way to control gravitational wave evolution.

Potential implications for early Universe cosmology.

Abstract

The cosmological background of gravitational waves can be tuned by Extended Theories of Gravity. In particular, it can be shown that assuming a generic function $f(R)$ of the Ricci scalar $R$ gives a parametric approach to control the evolution and the production mechanism of gravitational waves in the early Universe.