Entanglement entropy in an acoustic black hole scales linearly with subregion volume due to long-range correlations from horizon phonon pair production and is approximated by the thermal entropy of Hawking radiation.
Melkani, Physical Review Research5, 10.1103/physrevresearch.5.023035 (2023)
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Entanglement entropy of an acoustic black hole
Entanglement entropy in an acoustic black hole scales linearly with subregion volume due to long-range correlations from horizon phonon pair production and is approximated by the thermal entropy of Hawking radiation.