Cosmological coupling of local gravitational systems

Cosmological coupling of local gravitational systems

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 anis...

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Bibliographic Details
Main Authors: Cadoni, Mariano, Pitzalis, Mirko, Rodrigues, Davi C, Sanna, Andrea P
Format: Journal Article
Language:English
Published: 10-06-2024
Subjects:
Physics - Astrophysics of Galaxies
Physics - General Relativity and Quantum Cosmology
Online Access:Get full text
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Summary: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.
DOI:10.48550/arxiv.2406.06091