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Cosmological coupling of local gravitational systems

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arxiv 2406.06091 v2 pith:ZODJL7NT submitted 2024-06-10 gr-qc astro-ph.GA

Mariano Cadoni , Mirko Pitzalis , Davi C. Rodrigues , Andrea P. Sanna This is my paper · ORCID
classification gr-qcastro-ph.GA
keywords cosmologicalcouplinglocalmasssystemsallowedanisotropiesapply
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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.

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  1. Evaporating cosmologically coupled black holes

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    If a black hole's mass grows with cosmic expansion, Hawking evaporation is slowed or reversed, weakening gamma-ray bounds on primordial black holes.

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