3 citations · 11 across the 18 of their papers we have counts for
21 papers
Non-Markovian Cosmology with Causal Memory Kernels
Aritra Sanyal, Prabir Rudra
We investigate a non-Markovian extension of Friedmann cosmology in which the present expansion rate retains information about the past cosmic evolution through a causal memory kern…
The New Dark Matter Density Profile from JWST JADES Galaxies
Aritra Sanyal, Farook Rahaman
We present the first dark matter density profile derived directly from James Webb Space Telescope JADES Data Release~3 NIRSpec observations of galaxies spanning the cosmi…
Evolving wormhole cosmology: modified Friedmann dynamics and observational constraints
Aritra Sanyal, Kazuharu Bamba, Prabir Rudra
We construct an evolving wormhole cosmological model from a Morris--Thorne metric with a separable, time-dependent shape function in a spatially flat Friedmann--Lemaitre--Robertson…
A Dynamical-Photometric Phase Space for Spiral Galaxies: Probing the Local Coupling Between Light and Gravity
Aritra Sanyal, Farook Rahaman
The interplay between luminous matter distribution and the local gravitational field within disc galaxies encodes physical information beyond that captured by global scaling relati…
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,…
On the reconstruction of the Rotation Curve for Milky Way and its spacetime implications: a Machine Learning approach
Aritra Sanyal, Swapan Das, Farook Rahaman +1
We propose a machine learning-assisted analytical reconstruction of the Milky Way rotation curve and discuss its implications in a relativistic spacetime context. The rotation curv…
Interplay of Holographic and New Agegraphic Dark Energy in Cosmology: A hybrid dark energy model from a generalized length-time cut-off
Sayani Maity, Aritra Sanyal, Prabir Rudra
The spatial and temporal infrared cutoffs are the source of the Holographic dark energy (HDE) and New Agegraphic dark energy (NADE) models, respectively. Inspired by the spacetime…
Decoding the Gravitational Geometry and Stellar Photometric Profiles of Galaxy NGC 7331
Aritra Sanyal Bikramarka S. Choudhury Farook Rahaman
Galaxy rotation curves provide a powerful probe of mass distributions in spiral galaxies. We present a general relativistic analysis of NGC 7331 using its observed rotation curve a…
Exact Gravastar Solution
Farook Rahaman, Bikramarka S. Choudhury, Aritra Sanyal +2
Astrophysical black holes arise as exact solutions of the Einstein field equations. Therefore, any alternative, such as a gravastar, must satisfy the same level of mathematical rig…
Revisiting The Gravitational Mirroring In Presence of Compact Objects
Bikramarka S Choudhury, Aritra Sanyal, Md Khalid Hossain +1
We propose a novel concept of astrophysical mirroring in the schwarzschild framework, which emerges as a direct consequence of gravitational lensing effects occurring in the immedi…
Cosmic Hysteresis in Reconstructed Bounce Models A Torsion-Based Thermodynamic Perspective
Aritra Sanyal, Praveen Kumar Dhankar, Albert Munyeshyaka +3
We investigate the emergence of cosmic hysteresis in cyclic and bouncing cosmologies within the framework of reconstructed gravity. In contrast to curvature-based modificati…
Some New Types of Well-Behaved Polynomial Redshift Parametrization of Dark Energy Equation of State
Prabir Rudra, Aritra Sanyal, Promila Biswas +3
In this paper, we explore a new type of smooth and well-behaved polynomial redshift function that can avoid a future singularity. Using this function, we have proposed different re…
Testing the Generalized Second Law in -Dimensional Cosmology: Holographic Entropy Bounds and Observational Constraints
Praveen Kumar Dhankar, Aritra Sanyal, Safiqul Islam +2
We investigate the validity of the Generalized Second Law (GSL) of thermodynamics in a -dimensional holographic cosmological model with a negative cosmological constant. Ado…
Constraints on multi-fluid cosmology in modified Gauss-Bonnet gravity models with different observational data sets
Praveen Kumar Dhankar, Albert Munyeshyaka, Aritra Sanyal +2
In the present work, we incorporate redshift-space distortion measurement to investigate the growth of large scale structure within the framework of multi-fluid cosmology in the co…
Cosmic Hysteresis in Reconstructed Bounce Models: A Thermodynamic Study
Aritra Sanyal, Praveen Kumar Dhankar, Albert Munyeshyaka +2
We study the emergence of cosmic hysteresis in cyclic bouncing universes within the framework of analytically reconstructed gravity. Using exact bouncing scale factor soluti…
Observational constraints on holography in -dimensional cosmology with a generalized equation of state
Praveen Kumar Dhankar, Safiqul Islam, Saibal Ray +2
In this study we explore the cosmic holographic principle, as proposed by Fischler and Susskind~\cite{Fischler}, within the framework of -dimensional cosmological models.…
Ricci-Cubic Holographic Dark Energy: Confronting Observations, Stability and the Cosmic Coincidence Problem
Aritra Sanyal, Prabir Rudra
In this work, we constrain the parameter space of the Ricci-Cubic Holographic Dark Energy (RCHDE) model using several observational datasets, including Hubble parameter measurement…
Cosmic Hysteresis in Gravity: A Thermodynamic Perspective on Cyclic Bouncing Universes
Aritra Sanyal
We investigate the emergence of cosmic hysteresis in cyclic bouncing cosmologies within the framework of modified gravity theories. Building upon previous studies that explo…
Observational analysis of bulk viscous modified Chaplygin gas in (2+1)-dimensional universe using MCMC
Praveen Kumar Dhankar, Aritra Sanyal, Albert Munyeshyaka +2
This paper investigates regarding cosmological implications of a bulk viscous modified Chaplygin gas (MCG) in (2+1)-dimensional Friedmann-Robertson-Walker spacetime, incorporating…
Holographic description of unified early and late universe in viscous mimetic gravity
G. S Khadekar Saibal Ray Aritra Sanyal
In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (J. High Energy Phys. 11, 135, 2013), utilizing the holographic principle to coherently desc…
About Asymptotic continuation of Einstein equation
Aritra Sanyal, Valery B. Morozov
The energy density of the gravitational field is a full-fledged source of the gravitational field. This principle of Einstein was not implemented by him in the Einstein equation. N…