Research Projects

Recent observations of supermassive black hole in M87 by the Event Horizon Telescope stimulate scientists to study the accretion onto black holes in the theory of gravity. Using the accretion of test particles around the black holes, one can investigate the mass accretion rate of particles around the central object. There is a blank space in the research works as a very little study has been done on the actual characteristics of accretion disks around the black holes with weak and strong field regime. The gravitational energy of the accreting material contaminated to heat and some parts of the heat transforms into radiation. This radiation partly seepages, and chills the accretion disc. After receiving this radiation and analyzing its electromagnetic spectrum through radio, optical and X-ray telescopes , one can get information about the disk as well as compact object surrounded by the disk. In the analyze of mass accretion, one adopts geometrically thin accretion disk. In the project we will study the thin accretion disk properties of a rotating compact objects ( wormholes/black holes ) in details. In observational astrophysics, the hypothetical astrophysical objects like wormholes and black holes are still a viable subject. The observational detection means that one has to interact with the geometrical structure of the wormhole/black hole by which data is acquired. Therefore, scientists are trying to envisage wormholes/black holes in order to acquire perception about its geometrical features. Apart from gravitational lensing effects another possible method for probing wormholes or black holes is the usage of shadows (a dark region over a luminous contextual). One can recognize the shadow of a wormhole or black hole as the result of strong gravitational lensing generating a dark spot in the sky of a remote viewer. It is actually an optical look exhibited by the wormhole or black hole when there is a source of light (star) behind it, and there is an identical distribution of photons except for the area between the wormhole or black hole and the remote viewer from where visual evidence is obtained. This manifestation has been investigated theoretically as well as observationally. Recent ventures on the shadow of compact objects inspired us to study the shadow of wormholes or black holes as well as their shapes. Recently, it is proposed that Gauss-Bonnet Theory can be applied to the study of gravitational deflection of a particle ( massless or massive ) around a compact object. This is a more powerful method compare to previous methods existing in literature as for Gauss – Bonnet (G-B) method, the spacetimes need not be asymptotically flat. Therefore, it seems to me one can apply this G-B method for testing highly compact stars like X-ray binaries XTE J1739-285 and other which were suggested as strange stars.