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12.00 noon Astrophysical accretion as an analogue gravity phenomena Tapas Kumar Das Harish Chandra Research Institute, Allahabad. 13-03-09 Abstract I will First describe the theoretical modeling of the accretion of multi-transonic classical fluid onto astrophysical black holes. Starting from the theory of very simple (yet marvelously elegant) Newtonian Bondi accretion, the most general relativistic multi-transonic accretion in the Kerr metric will be developed. I will then demonstrate how the accretion of matter onto astrophysical black holes (rather, transonic accretion process onto any astrophysical objects in general) can be considered as an unique and the ideal most example of the classical analogue gravity model naturally found in the Universe. I also plan to demonstrate how such multi-transonic flow model can be applied to explain various astrophysical phenomena, like generation of the AGN outflow and the X ray flares from our Galactic centre, or origin of the quasi periodic oscillation of black hole candidates.
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