185 citations · 4.3k across the 135 of their papers we have counts for
136 papers · 1 filter
Relativistic stellar collapse of initially static configurations
Keshlan S. Govinder, Megandhren Govender, Sunil Maharaj
We study the dynamics of a radiating relativistic star in the presence of the electromagnetic field and the cosmological constant. The evolution of the model originates from an ini…
Temperature of free gravitational field: A geometrical perspective
Samarjit Chakraborty, Gareth Amery, Sunil D Maharaj +1
In this paper, using a novel geometrical approach, we relate the concept of the thermodynamic temperature of the free gravitational field, to the non-affinity of real null geodesic…
Arrow of time problem in gravitational collapse
Samarjit Chakraborty, Sunil D. Maharaj, Rituparno Goswami +1
We investigate the arrow of time problem in the context of gravitational collapse of radiating stars in higher dimensions for both neutral and charged matter. The interior spacetim…
Complexity and structure scalars of Type II matter fields
Samarjit Chakraborty, Rituparno Goswami, Sunil D. Maharaj
A general semi-tetrad covariant approach is adopted to analyse the structure scalars of a Type II fluid in generalized Vaidya spacetime. The relationship between the covari…
Ricci-Weyl curvature balance in viscous dissipative collapse: A covariant analysis of singularity censorship
Samarjit Chakraborty, Rituparno Goswami, Sunil D. Maharaj +1
We investigate the cosmic censorship conjecture in a spherically symmetric collapse with shear and bulk viscosity, heat flux, and pressure anisotropy, imposing physically reasonabl…
Absence of curvature singularities in symmetric perfect fluid spacetimes in Einstein-Gauss-Bonnet Gravity
Aavishkar Madhunlall, Chevarra Hansraj, Rituparno Goswami +1
In this paper we study the higher dimensional homogeneous and isotropic perfect fluid spacetimes in Einstein-Gauss-Bonnet (EGB) gravity. We solve the modified field equations with…
Arrow of time and gravitational entropy in collapse
Samarjit Chakraborty, Sunil D. Maharaj, Sarbari Guha +1
We investigate the status of the gravitational arrow of time in the case of a spherical collapse of a fluid that conducts heat and radiates energy. In particular, we examine the re…
Transient electromagnetic sources can detect solitary black holes in Milky Way galaxy
Susmita Jana, Rituparno Goswami, S. Shankaranarayanan +1
The Milky Way galaxy is estimated to host up to a billion stellar-mass solitary black holes (BHs). The number and distribution of BH masses can provide crucial information about th…
Electromagnetic extension of Buchdahl bound in gravity
Soumik Bhattacharya, Ranjan Sharma, Sunil D. Maharaj
We develop a static charged stellar model in gravity where the modification is assumed to be linear in which is the trace of the energy momentum tensor. The exterior s…
EDSFD parametrization in gravity with linear curvature terms
J. K. Singh, Shaily, Harshna Balhara +2
This paper investigates the flat Friedmann-Lematre-Robertson-Walker (FLRW) cosmological model using a suitable parameterization represented as a differential equation…
What makes a shear-free spherical perfect fluid be inhomogeneous with tidal effects?
Jonathan Hakata, Rituparno Goswami, Chevarra Hansraj +1
This is an important and natural question as the spacetime shear, inhomogeneity and tidal effects are all intertwined via the Einstein field equations. However, as we show in this…
Rotating Kiselev Black Holes in Gravity
Sushant G. Ghosh, Shafqat Ul Islam, Sunil D. Maharaj
Exact solutions describing rotating black holes can provide significant opportunities for testing modified theories of gravity, which are motivated by the challenges posed by dark…
Testing Rotating Regular Metrics with EHT Results of Sgr A*
Rahul Kumar Walia, Sushant G Ghosh, Sunil D Maharaj
The Event Horizon Telescope (EHT) observation unveiled the first image of supermassive black hole Sgr A* showing a shadow of diameter as with fractional devi…
Gaussian curvature of spherical shells: A geometric measure of complexity
Sayuri Singh, Dharmanand Baboolal, Rituparno Goswami +1
In this paper we consider a semitetrad covariant decomposition of spherically symmetric spacetimes and find a governing hyperbolic equation of the Gaussian curvature of two dimensi…
Stability analysis of circular orbits around a traversable wormhole with massless conformally coupled scalar field
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We study the stability of circular orbits in the background of a traversable wormhole (TWH) spacetime obtained as a solution of Einstein's field equations coupled conformally to a…
Geodesic stability and quasinormal modes of non-commutative Schwarzschild black hole employing Lyapunov exponent
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We study the dynamics of test particle and stability of circular geodesics in the gravitational field of a non-commutative geometry inspired Schwarzschild black hole spacetime (NCS…
Strong gravitational lensing by Bardeen black holes in 4D EGB gravity: constraints from supermassive black holes
Shafqat Ul Islam, Sushant G. Ghosh, Sunil D. Maharaj
Observation indicates that many nearby galaxies host supermassive central black holes. Modelling Bardeen models in four-dimensional Einstein-Gauss-Bonnet (4D EGB) gravity, with add…
Stability analysis of circular orbits around a charged BTZ black hole spacetime in a nonlinear electrodynamics model via Lyapunov exponents
Shobhit Giri, Hemwati Nandan, Lokesh Kumar Joshi +1
We investigate the existence and stability of both the timelike and null circular orbits for a (2+1) dimensional charged BTZ black hole in Einstein-nonlinear Maxwell gravity with a…
A semi-tetrad decomposition of the Kerr spacetime
Chevarra Hansraj, Rituparno Goswami, Sunil D. Maharaj
In this paper we perform a semi-tetrad decomposition of the Kerr spacetime. We apply the 1+1+2 covariant method to the Kerr spacetime in order to describe its geometry outside the…
Rotating Black Holes in Horndeski Gravity: Thermodynamic and Gravitational Lensing
Rahul Kumar Walia, Sunil D. Maharaj, Sushant G. Ghosh
The lack of rotating black holes, typically found in nature, hinders testing modified gravity from astrophysical observations. We present the axially symmetric counterpart of an ex…
Nonsingular black hole chemistry
Arun Kumar, Sushant G. Ghosh, Sunil D. Maharaj
We study the nonsingular black hole in Anti de-Sitter background taking the negative cosmological constant as the pressure of the system. We investigate the horizon structure, and…
Necessity of spacetime shear for cosmological gravitational waves
Roger M. Mayala, Rituparno Goswami, Sunil D. Maharaj
We show that a general but shear-free perturbation of homogeneous and isotropic universes are necessarily silent, without any gravitational waves. We prove this in two steps. First…
On homothetic Killing vectors in stationary axisymmetric vacuum spacetimes
Abbas M. Sherif, Peter K. S. Dunsby, Rituparno Goswami +1
In this paper we consider homothetic Killing vectors in the class of stationary axisymmetric vacuum (SAV) spacetimes, where the components of the vectors are functions of the time…
Matter shear and vorticity in conformally flat spacetimes
Roger Mayala, Rituparno Goswami, Sunil D. Maharaj
In this paper we consider conformally flat perturbations on the Friedmann Lemaitre Robertson Walker (FLRW) spacetime containing a general matter field. Working with the linearised…