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Acoustic horizons in axially symmetric relativistic accretion
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Transonic accretion onto astrophysical objects is a unique example of analogue black hole realized in nature. In the framework of acoustic geometry we study axially symmetric accretion and wind of a rotating astrophysical black hole or of a neutron star assuming isentropic flow of a fluid described by a polytropic equation of state. In particular we analyze the causal structure of multitransonic configurations with two sonic points and a shock. Retarded and advanced null curves clearly demonstrate the presence of the acoustic black hole at regular sonic points and of the white hole at the shock. We calculate the analogue surface gravity and the Hawking temperature for the inner and the outer acoustic horizons.
Forward citations
Cited by 2 Pith papers
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Gravity as emergent phenomena for spherically symmetric black hole accretion of multi-component flow with relativistic equation of state
Spherical accretion of a multi-species relativistic fluid with variable gamma produces an acoustic black hole metric whose surface gravity grows with flow energy and proton fraction.
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Emergent gravity from Michel flow with position dependent adiabatic index
Derives acoustic metric and sonic horizon from stable Michel flows with position-dependent adiabatic index in GR Bondi accretion.
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