29 citations · 288 across the 23 of their papers we have counts for
23 papers
The River Model of Gravitational Collapse
Soumya Chakrabarti
We show that the transformation of a time-evolving spherically symmetric metric tensor into a Painleve-Gullstrand-Lemaitre form brings forth a few curious consequences. The time ev…
Can a variation of Fine Structure Constant influence the fate of Gravitational Collapse?
Soumya Chakrabarti
We show that it is possible to steer clear of a spacetime singularity during gravitational collapse by considering the time-variation of a fundamental coupling, in this case, the f…
Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
Soumya Chakrabarti, Koushik Dutta, Jackson Levi Said
We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requi…
Scalar-Fermion Interaction as the Driver of Cosmic Acceleration
Soumya Chakrabarti, Amitabha Lahiri
We argue that an interacting scalar-fermion distribution can be used to demonstrate the cosmic acceleration in General Relativity. The interaction is of Yukawa nature and it drives…
On Generalized Theories of Varying Fine Structure Constant
Soumya Chakrabarti
We work with a class of scalar extended theory of gravity that can drive the present cosmic acceleration as well as accommodate a mild cosmic variation of the fine structure consta…
Cosmic Variation of Proton to Electron Mass Ratio with an interacting Higgs Scalar Field
Soumya Chakrabarti
We discuss that it is quite possible to realize the smooth transition of the universe between a matter/radiation dominated deceleration and a dark energy dominated acceleration, ev…
A wormhole geometry from gravitational collapse
Soumya Chakrabarti, Sayan Kar
We discuss a proposal on how gravitational collapse of a NEC (Null Energy Condition) violating spherically symmetric fluid distribution can avoid the formation of a zero proper vol…
Cosmic Acceleration in an Extended Brans-Dicke-Higgs Theory
Soumya Chakrabarti
We consider an extended scalar-tensor theory of gravity where the action has two interacting scalar fields, a Brans-Dicke field which makes the effective Newtonian constant a funct…
Geodesic Congruences and a Collapsing Stellar Distribution in f (T ) Theories
Soumya Chakrabarti, Jackson Levi Said
Teleparallel Gravity (TG) describes gravitation as a torsional- rather than curvature-based effect. As in curvature-based constructions of gravity, several different formulations c…
A Collapsing Distribution of Axion Dark Matter
Soumya Chakrabarti
The manuscript deals with an interacting scalar field that mimics the evolution of the so-called Axion Scalar Dark Matter or Axion like particles with ultra-light masses. It is dis…
Self Similar Collapse and the Raychaudhuri equation
Shibendu Gupta Choudhury, Soumya Chakrabarti, Ananda Dasgupta +1
The role of the Raychaudhuri equation in studying gravitational collapse is discussed. A self-similar distribution of a scalar field along with an imperfect fluid in a conformally…
Exact Solutions and Accelerating Universe in Modified Brans-Dicke Theories
Purba Mukherjee, Soumya Chakrabarti
Exact solutions are studied in the context of modified Brans-Dicke theory. The non-linearity of the modified Brans-Dicke field equations is treated with the Euler-Duarte-Moreira me…
On Reconstruction of Extended Teleparallel Gravity from the Cosmological Jerk Parameter
Soumya Chakrabarti, Jackson Levi Said, Kazuharu Bamba
Teleparallel gravity offers a path to resolve a number of longstanding issues in general relativity by re-interpreting gravitation as an artifact of torsion rather than curvature.…
Reconstruction of lagrangian from a massive scalar field
Soumya Chakrabarti, Kazuharu Bamba, Jackson Levi Said
We present a reconstruction of the Lagrangian for gravity by using a massive scalar field. The scalar field is minimally coupled to the action of gravity. We demonstr…
Conformally Flat Collapsing Stars in f (R) gravity
Soumya Chakrabarti, Rituparno Goswami, Sunil Maharaj +1
The present work includes an analytical investigation of a collapsing spherical star in f (R) gravity. The interior of the collapsing star admits a conformal flatness. Information…
Collapsing spherical star in Scalar-Einstein-Gauss-Bonnet gravity with a quadratic coupling
Soumya Chakrabarti
We study the evolution of a self interacting scalar field in Einstein-Gauss-Bonnet theory in four dimension where the scalar field couples non minimally with the Gauss-Bonnet term.…
Some aspects of reconstruction using a scalar field in f (T ) Gravity
Soumya Chakrabarti, Jackson Levi Said, Gabriel Farrugia
General relativity characterizes gravity as a geometric property exhibited on spacetime by massive objects while teleparallel gravity achieves the same results, at the level of equ…
Aspects of Gravitational Collapse and the formation of Spacetime Singularities
Soumya Chakrabarti
Possibilities emerging out of the dynamical evolutions of collapsing systems are addressed in this thesis through analytical investigations of the highly non-linear Einstein Field…
Self-similar scalar field collapse
Narayan Banerjee, Soumya Chakrabarti
A spherically symmetric collapsing scalar field model is discussed with a dissipative fluid which includes a heat flux. This vastly general matter distribution is analyzed at the e…
Scalar Field Collapse with an exponential potential
Soumya Chakrabarti
An analogue of the Oppenheimer-Synder collapsing model is treated analytically, where the matter source is a scalar field with an exponential potential. An exact solution is derive…
Scalar field collapse in a conformally flat spacetime
Soumya Chakrabarti, Narayan Banerjee
The collapse scenario of a scalar field along with a perfect fluid distribution is investigated for a conformally flat spacetime. The theorem for the integrability of an anharmonic…
Gravitational collapse in f(R) gravity for a spherically symmetric spacetime admitting a homothetic Killing vector
Soumya Chakrabarti, Narayan Banerjee
The gravitational collapse of a spherical distribution, in a class of f(R) theories of gravity, where f(R) is power function of R, is discussed. The spacetime is assumed to admit a…
Spherically symmetric collapse of a perfect fluid in f(R) gravity
Soumya Chakrabarti, Narayan Banerjee
The present work investigates the gravitational collapse of a perfect fluid in gravity models. For a general theory, it is shown analytically that a collapse is quite…