52 citations · 200 across the 24 of their papers we have counts for
26 papers
Dynamic Quantum Wormholes: Path-Integral State Selection and the Quantum Throat Trajectory in an Exactly Solvable Thin-Shell Model
Rikpratik Sengupta, Paulo Vargas Moniz
We construct a minisuperspace quantization of a dynamic, spherically symmetric thin-shell wormhole in the spirit of pilot-wave quantum cosmology, treating the throat radius …
Bouncing Dust Collapse and Black-to-White Hole Transition on the Brane
Rikpratik Sengupta, Chiranjeeb Singha
We study the spherical collapse of a homogeneous dust cloud on a three-brane in the Shtanov--Sahni braneworld, in which the extra dimension is timelike. In the high-energy regime t…
Cycles Without End: An Ekpyrotic Braneworld Bounce with a Kinetically Coupled Entropic Mechanism
Rikpratik Sengupta
Cyclic cosmologies replace inflation's single creation event with an eternal sequence of smooth turnarounds, but three problems have historically stood in their way: singular bounc…
Accelerating expansion and isotropic sky-hemisphere consistency in Pantheon+ supernovae: a revised analysis in the dark energy debate
Saibal Ray, Maxim Khlopov, Aritra Sanyal +2
We perform four independent decompositions of the deceleration parameter using 1564 Type Ia supernovae (SNe Ia) from the Pantheon+ catalogue: by redshift bin, sky hemisphere,…
A Potential Black Hole Mimicker From Non-Minimal Coupling
Debanjan Debnath, Rikpratik Sengupta, Kaushik Bhattacharya
We present a class of horizonless, regular ultra-compact objects arising in a theory of gravity that allows curvature-fluid coupling. The non-minimal interaction between fluid vari…
Bounce, Turnaround, and the Anisotropy Problem in Cyclic Cosmology on a Brane with a Timelike Extra Dimension
Rikpratik Sengupta, Arkajit Aich, Kaushik Bhattacharya
We study cosmological bounces, turnarounds, and cyclic evolution on an anisotropic Bianchi-I brane embedded in a five-dimensional bulk with a \emph{timelike} extra dimension, withi…
Gravastars on the brane with a timelike extra dimension
Shounak Ghosh, Rikpratik Sengupta, Kazuharu Bamba
We construct a gravastar configuration within the Shtanov-Sahni (SS) braneworld scenario, characterized by a timelike extra dimension and negative brane tension. Unlike classical b…
Gravitational collapse and singularity avoidance of a homogeneous dust fluid on a brane with timelike extra dimension
Rikpratik Sengupta, Chiranjeeb Singha
We investigate the gravitational collapse of a homogeneous dust cloud in the Shtanov Sahni braneworld model, which incorporates an extra timelike dimension. The interior of the col…
Co-existence of alternative Generalized Chaplygin Gas and other Dark Energies in the Framework of Fractal Universe
Mahasweta Biswas, Rikpratik Sengupta, Ujjal Debnath
We have explored the possibility of the co-existence of two forms of dark energy in the form of an alternative Generalized Chaplygin Gas (GCG) along with a scalar field of field th…
A novel model of non-singular oscillating cosmology on flat Randall-Sundrum II braneworld
Rikpratik Sengupta
We obtain a \textit{novel} model of oscillating non-singular cosmology on the spatially flat Randall-Sundrum (RS) II brane. At early times, the universe is dominated by a scalar fi…
Gravastar in the framework of Loop Quantum Cosmology
Shounak Ghosh, Rikpratik Sengupta, Mehedi Kalam
In this paper we attempt to construct a regular gravastar model using the UV corrected framework of Loop Quantum Cosmology. We find that a stable gravastar model can be constructed…
Lorentzian wormhole in the framework of loop quantum cosmology
Rikpratik Sengupta, Shounak Ghosh, Mehedi Kalam
In this paper, we construct a traversable static Lorentzian wormhole in the effective scenario of Loop Quantum Cosmology (LQC), where the field equations are modified due to the ul…
Traversable Lorentzian wormhole on the Shtanov-Sahni braneworld with matter obeying the energy conditions
Rikpratik Sengupta, Shounak Ghosh, M. Kalam
In this paper we have explored the possibility of constructing a traversable wormhole on the Shtanov-Sahni braneworld with a timelike extra dimension. We find that the Weyl curvatu…
Observationally constrained emergent universe scenario with non-conventional late-time dynamics
Rikpratik Sengupta, Anirban Chanda, B C Paul +1
In this paper, we attempt to explore the possibility of a obtaining a viable emergent universe scenario supported by a type of fluid known as the extended Chaplygin gas, which exte…
Lorentzian wormholes in an emergent universe
Rikpratik Sengupta, Shounak Ghosh, B C Paul +1
A non-singular Emergent Universe (EU) scenario within the realm of standard Relativistic physics requires a generalization of the Equation of State (EoS) connecting the pressure an…
Non-singular flat universes in braneworld and Loop Quantum Cosmology
Rikpratik Sengupta, B. C. Paul, M. Kalam +2
In this paper we take matter source with non-linear Equation of state (EoS) that has produced non-singular Emergent cosmology for spatially flat universe in General Relativity and…
Weyl transformation: a dynamical degree of freedom in the light of Dirac's Large Number Hypothesis
Prasenjit Paul, Rikpratik Sengupta, Saibal Ray
In Einstein's Field Equation(EFE) the geometry of the space-time is connected with the matter distribution. The geometry or the gravitational sector deals with classical macroscopi…
Lorentzian wormholes supported by tachyon matter
Rikpratik Sengupta, Shounak Ghosh, Mehedi Kalam
Wormholes with Ellis geometry have been successfully constructed using tachyon matter \cite{Das}. However, for such a wormhole, it is obtained that the redshift function is necessa…
Gravastar under the framework of braneworld gravity II: effect of the Kuchowicz metric function
Saibal Ray, Shounak Ghosh, Rikpratik Sengupta
In recent years, a class of compact objects called gravastars have drawn immense interest as regular solutions to end state stellar collapse. Since the energy density involved in c…
Wormhole on the Brane with Ordinary Matter: The Broader View
Rikpratik Sengupta, Shounak Ghosh, Mehedi Kalam +1
In this paper we attempt to examine the possibility of construction of a traversable wormhole on the Randall-Sundrum braneworld with ordinary matter employing the Kuchowicz potenti…
Modified Power law Inflation: solution to the graceful exit problem and improvement of dark energy models
Prasenjit Paul, Rikpratik Sengupta, Saibal Ray
We study power law inflation (PLI) with a monomial potential and find a novel exact solution. It is well known that conventional PLI with exponential potential is inconsistent with…
Skyrme Fluid in Anisotropic Universe
Rikpratik Sengupta, B C Paul, Prasenjit Pal
Cosmological solutions are obtained in an anisotropic Kantowski-Sachs (KS) and Bianchi Type-I universes considering a cosmological constant with Skyrme fluid. Interestingly, the so…
Gravastar under the framework of Braneworld Gravity
Rikpratik Sengupta, Shounak Ghosh, Saibal Ray +2
Gravastars have been considered as a serious alternative to black holes in the past couple of decades. Stable models of gravastar have been constructed in many of the alternate gra…
Bouncing Models in an Extended Gravity Theory
S K Tripathy, B Mishra, Saibal Ray +1
Some bouncing models are investigated in the framework of an extended theory of gravity. The extended gravity model is a simple extension of the General Relativity where an additio…