3 citations · 11 across the 18 of their papers we have counts for
11 papers · 1 filter
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…