Gravitational luminosity of a hot plasma in R^2 gravity

TL;DR

This paper calculates the gravitational energy loss of a hot plasma in R^2 gravity, deriving its dependence on temperature and comparing it to Einstein gravity, with results aligning well with solar data.

Contribution

It provides the first explicit calculation of gravitational bremsstrahlung in R^2 gravity for hot plasmas, highlighting differences from Einstein gravity.

Findings

Gravitational luminosity depends explicitly on plasma temperature.

Results agree with observational data for the Sun.

Demonstrates the relevance of R^2 gravity in astrophysical contexts.

Abstract

The R^{2}-gravity contribution to energy loss of a hot plasma due to the gravitational bremsstrahlung is calculated in the linearized theory on the basis of classical Coulomb scattering of plasma constituents in small-angle scattering approximation. The explicit dependence of the gravitational luminosity on the plasma temperature is derived and its relevance to the Einstein gravity is demonstrated. The result when applied to the Sun as a hot plasma, shows very good agreement with available data.