European Physical Journal C: Particles and Fields (Mar 2022)

Detectable universes inside regular black holes

  • Zacharias Roupas

DOI
https://doi.org/10.1140/epjc/s10052-022-10202-6
Journal volume & issue
Vol. 82, no. 3
pp. 1 – 14

Abstract

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Abstract While spacetime in the vicinity outside astrophysical black holes is believed to be well understood, the event horizon and the interior remain elusive. Here, we discover a degenerate infinite spectrum of novel general relativity solutions with the same mass-energy and entropy that describe a dark energy universe inside an astrophysical black hole. This regular cosmological black hole is stabilized by a finite tangential pressure applied on the dual cosmological-black hole event horizon, localized up to a quantum indeterminacy. We recover the Bekenstein–Hawking entropy formula from the classical fluid entropy, calculated at a Tolman temperature equal to the cosmological horizon temperature. We further calculate its gravitational quasi-normal modes. We find that cosmological black holes are detectable by gravitational-wave experiments operating within the $$\mu \mathrm{Hz}$$ μ Hz – $$\mathrm{Hz}$$ Hz range, like LISA space-interferometer.