https://doi.org/10.1140/epjc/s10052-022-10202-6
Regular Article - Theoretical Physics
Detectable universes inside regular black holes
1
Department of Physics, University of Crete, 70013, Herakleion, Greece
2
The British University in Egypt, Sherouk City 11837, Cairo, Egypt
Received:
11
January
2022
Accepted:
9
March
2022
Published online:
24
March
2022
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 
–
range, like LISA space-interferometer.
© The Author(s) 2022
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