Cosmological coupling of local gravitational systems
General Relativity and Quantum Cosmology
2024-06-18 v2 Astrophysics of Galaxies
Abstract
We investigate the cosmological coupling of spherical, local astrophysical systems. We derive a general formula quantifying the cosmological coupling of the Misner-Sharp mass of these objects. We show that, in the weak-field limit, the cosmological coupling is only allowed if there are pressure anisotropies. We also apply our results to galaxies, modelling them with the Navarro-Frenk-White and Einasto profiles. We show that the galactic mass can be coupled to the cosmological dynamics and examine its dependence on the scale factor of the universe.
Keywords
Cite
@article{arxiv.2406.06091,
title = {Cosmological coupling of local gravitational systems},
author = {Mariano Cadoni and Mirko Pitzalis and Davi C. Rodrigues and Andrea P. Sanna},
journal= {arXiv preprint arXiv:2406.06091},
year = {2024}
}
Comments
27 pages, 7 figures. Some typos corrected, one reference added