Forces parallel to particle trajectories in relativistic gravity

TL;DR

This paper explores forces aligned with particle trajectories in relativistic gravity, providing physical insights and Newtonian analogues to understand their role in cosmology and scalar-tensor theories.

Contribution

It introduces a detailed analysis of forces parallel to particle paths in relativistic gravity, linking them to Newtonian analogues for better intuition.

Findings

Identification of conditions for forces parallel to trajectories in relativistic contexts

Connection between relativistic forces and Newtonian analogues

Implications for cosmology and scalar-tensor gravity theories

Abstract

Forces parallel to particle trajectories occur in physically meaningful situations, including relativistic cosmology and Einstein frame scalar-tensor gravity. These situations have Newtonian analogues that we discuss to provide intuition about the underlying physics.