Quantum Gravitational Bremsstrahlung, Massless versus Massive Gravity

TL;DR

This paper applies a unique massive spin-2 quantum gauge theory to calculate gravitational bremsstrahlung, demonstrating smooth transition to massless theory results as graviton mass approaches zero, with no strong coupling issues.

Contribution

It introduces a consistent massive gravity framework and computes bremsstrahlung cross sections, showing their smooth limit to massless gravity without defects.

Findings

Cross sections smoothly transition to massless results as graviton mass vanishes.

The theory is free from strong coupling issues at small graviton masses.

Massless cross sections are explicitly calculated for the full tensor theory.

Abstract

The massive spin-2 quantum gauge theory previously developed is applied to calculate gravitational bremsstrahlung. It is shown that this theory is unique and free from defects. In particular, there is no strong coupling if the graviton mass becomes small. The cross sections go over smoothly into the ones of the massless theory in the limit of vanishing graviton mass. The massless cross sections are calculated for the full tensor theory.