We linearly perturb advective isothermal transonic accretion onto rotating astrophysical
black holes to study the emergence of the relativistic acoustic spacetime and to investigate …

For accretion onto astrophysical black holes, we demonstrate that linear perturbation of
Bernoulli's constant defined for an inviscid irrotational adiabatic flow of perfect ideal fluid …

For certain geometric configurations of matter falling onto a rotating black hole, we develop a
novel linear perturbation analysis scheme to perform the stability analysis of stationary …

For low angular momentum axially symmetric accretion flow maintained in hydrostatic
equilibrium along the vertical direction, the value of the Mach number at the critical points …

In this work, we construct and study the Carter-Penrose diagram for sonic black hole and
white hole analogs as manifested in the analog spacetime embedded inside the flow of …

For axially symmetric accretion maintained in the hydrostatic equilibrium along the vertical
direction in the Kerr metric, the radial Mach number does not become unity at the critical …

For certain geometric configuration of matter falling onto a rotating black hole, we develop a
novel linear perturbation analysis scheme to perform the stability analysis of stationary …

Now it is the turn to thank my fellow HRI mates with whom I have spent some beautiful years
of my life in HRI. When I joined HRI, that was the first time I was away from my home, away …

In the previous chapters, we investigated the emergence of acoustic spacetime metric and
its properties for accretion on to Schwarzschild and Kerr black hole where the accreting …