In Michel accretion, Eulerian perturbations generate an acoustic black hole metric where outward acoustic waves tunnel through the sonic horizon, producing Hawking phonons with temperature and frequency enhanced by the background spacetime geometry.
Acoustic Hawking radiation as a tunnelling effect in Michel accretion
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abstract
Michel accretion becomes transonic at the saddle point of a dynamical system. An Eulerian perturbation on the steady inflow produces the metric of an acoustic black hole. As a high-frequency travelling wave the perturbation does not destabilize the steady inflow. Acoustic waves propagating outwards against the fluid inflow are blocked at the sonic barrier but can tunnel through it with an exponentially decaying amplitude. The Hawking temperature and the frequency of the Hawking phonons are enhanced by the spacetime geometry.
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Acoustic Hawking radiation as a tunnelling effect in Michel accretion
In Michel accretion, Eulerian perturbations generate an acoustic black hole metric where outward acoustic waves tunnel through the sonic horizon, producing Hawking phonons with temperature and frequency enhanced by the background spacetime geometry.