Quasi-geodesics in relativistic gravity
General Relativity and Quantum Cosmology
2021-02-03 v1 Cosmology and Nongalactic Astrophysics
Abstract
A four-force parallel to the trajectory of a massive particle can always be eliminated by going to an affine parametrization, but the affine parameter is different from the proper time. The main application is to cosmology, in which elements of the cosmic fluid are subject to a pressure gradient parallel to their four-velocities. Natural implementations of parallel four-forces occur when the particle mass changes and in scalar-tensor cosmology.
Keywords
Cite
@article{arxiv.2011.05891,
title = {Quasi-geodesics in relativistic gravity},
author = {Valerio Faraoni and Geneviève Vachon},
journal= {arXiv preprint arXiv:2011.05891},
year = {2021}
}
Comments
13 pages, no figures