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Quasi-geodesics in relativistic gravity (2011.05891v1)
Published 11 Nov 2020 in gr-qc and astro-ph.CO
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.
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