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Black hole event horizons are cosmologically coupled

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arxiv 2407.14549 v2 pith:4HV7DXXY submitted 2024-07-17 gr-qc astro-ph.CO

classification gr-qcastro-ph.CO
keywords blackeventholeholeshorizoncannotcosmologicalcosmologically
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It is shown that an exactly static and spherically symmetric black hole event horizon cannot be embedded in a time-dependent geometry. Forcing it to do so results in a naked null singularity at the would-be horizon. Therefore, since the universe is expanding, black holes must couple to the cosmological expansion, which was suggested as the growth mechanism for supermassive black holes in galaxies, with implications for the dark energy puzzle.

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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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