Claim: The main focus of Sandip Chakrabarti's research is the hydrodynamic and radiative properties of astrophysical flows around black holes (only black holes, not really including other compact objects) where he showed that the accreting matter must be transonic and should have standing, oscillating and propagating shocks.
Evidence: The main focus of Chakrabarti's research is the hydrodynamic and radiative properties of astrophysical flows around black holes and other compact objects.