Tapas Kumar Das
Investigation of the behaviour of accreting matter
close to the event horizon is of fundamental
importance in relativistic and
high energy astrophysics because they provide
the key features of the diagonostic spectra of
the stellar mass and super-massive
black holes. In this essay we provide a
self-consistent analysis of general relativistic black
hole accretion in Schwarzschild
metric which may form more than one critical
(sonic) points. We identify the parameter space
allowing such multi-transonic
accretion and discuss related flow topologies.
For the first time in literature
we compute the values of various
dynamical and thermodynamic multi-transonic
flow variables extremely close to the event horizon
and study the dependence
of these variables on fundamental accretion parameters.
Our calculation is useful for a better understanding
of Hawking
radiation from accoustic black holes.
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