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.
Giovanazzi, Physical Review Letters94, 10.1103/physrevlett.94.061302 (2005)
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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.