Pseudo-schwarzschild spherical accretion as a classical black hole analogue |
| |
Authors: | Surajit?Dasgupta Neven?Bilic Email author" target="_blank">Tapas?K?DasEmail author |
| |
Institution: | (1) Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai, 400005, India;(2) Rudjer Bošković Institute, 10002 Zagreb, Croatia;(3) Theoretical Physics Division, Harish Chandra Research Institute, Allahabadh, 211019, India |
| |
Abstract: | We demonstrate that a spherical accretion onto astrophysical black holes, under the influence of Newtonian or various post-Newtonian
pseudo-Schwarzschild gravitational potentials, may constitute a concrete example of classical analogue gravity naturally found
in the Universe. We analytically calculate the corresponding analogue Hawking temperature as a function of the minimum number
of physical parameters governing the accretion flow. We study both the polytropic and the isothermal accretion. We show that
unlike in a general relativistic spherical accretion, analogue white hole solutions can never be obtained in such post-Newtonian
systems. We also show that an isothermal spherical accretion is a remarkably simple example in which the only one information–the
temperature of the fluid, is sufficient to completely describe an analogue gravity system. For both types of accretion, the
analogue Hawking temperature may become higher than the usual Hawking temperature. However, the analogue Hawking temperature
for accreting astrophysical black holes is considerably lower compared with the temperature of the accreting fluid. |
| |
Keywords: | Accretion Black hole physics Hydrodynamics Analogue gravity Hawking radiation |
本文献已被 SpringerLink 等数据库收录! |
|