Black hole in an invisible ocean: how dark matter reshapes the abyss ✎ express

Original: "Born-Infeld AdS Black Holes Surrounded by Perfect Fluid Dark Matter"

· Behzad Eslam Panah, Bilel Hamil, Manuel E. Rodrigues

arXiv:2603.14159 · 2026-03-15 · arXiv non-exclusive · independent analysis · 1 min

Dark matter and peculiar electromagnetic fields change how black holes behave, sometimes even forcing them to 'freeze'.

A black hole shrouded in dark matter is like a whirlpool in invisible water. This substance reveals itself only through gravity. Physicists added a special electromagnetic field to the model, but the main effect comes from dark matter: it warps spacetime, shifting stable orbits and the photon sphere (the ring of trapped light).

The black hole itself can undergo a phase transition, like melting or freezing, under the pressure of dark energy.

It can be thought of as a heat engine: the efficiency of converting heat into work depends on the density of the surrounding dark matter. This builds on the ideas of Hawking and Bekenstein about black hole thermodynamics and their entropy (a measure of disorder).

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If our Galaxy's central black hole found itself inside a dense dark matter cloud, the orbits of stars would be noticeably warped, and astronomers could glimpse this invisible hand.

Scientists

Stephen Hawking Jacob Bekenstein Vera Rubin Fritz Zwicky Karl Schwarzschild Subrahmanyan Chandrasekhar

Concepts

First law of black hole mechanics schwarzschild metric Stefan–Boltzmann law black hole thermodynamics kerr metric Witten's positive energy theorem Einstein field equations stefan boltzmann constant wald entropy Birkhoff's theorem event horizon stability free energy tidal charge mass inflation Bekenstein-Hawking entropy horizon area entropic shadow charge to mass ratio Boltzmann equation anti de sitter space

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Black hole in an invisible ocean: how dark matter reshapes the abyss ✎ express