Behaviour of matter close to the event horizon

Investigation of the behaviour of accreting matter close to the black hole event horizon is of fundamental importance in relativistic and high-energy astrophysics because it provides the key features of the diagnostic spectra of stellar-mass and supermassive black holes. In this paper, we examine the terminal behaviour of general relativistic matter in multi-transonic, advective black hole accretion discs. We compute, for the first time we believe, the values of various dynamical and thermodynamic multi-transonic flow variables extremely close ( less than or equal to 0.01r(g)) 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 acoustic black holes.