Sister Nivedita University

output

20152025

most citedIndependent-oscillator model and the quantum Langevin equation for an oscillator: A review

10 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

20 papers

cond-mat.stat-mech2025

Spin-orbit coupled spin-boson model : A variational analysis

Sudip Sinha, Subhasis Sinha, Sushanta Dattagupta

The spin-boson (SB) model is a standard prototype for quantum dissipation, which we generalize in this work, to explore the dissipative effects on a one-dimensional spin-orbit (SO)…

astro-ph.CO2025

Observational Insights on DBI K-essence Models Using Machine Learning and Bayesian Analysis

Samit Ganguly, Arijit Panda, Eduardo Guendelman +3

We perform a late-time cosmological study; we compare the performance of two Dirac-Born-Infeld (DBI)-type k-essence scalar field extensions of the $Λ$ CDM model to the standard fram…

gr-qc2025

From Geometry to Observation: Gravitational Waves and the Raychaudhuri Equation

Sougata Bhunia, Anubhab Dutta, Debashis Gangopadhyay +1

Gravitational waves (GWs) are independent of any particular theory of gravity. The universality of this notion is highlighted by the Raychaudhuri equation (RE), which is independen…

gr-qc2025★ 3 cited

Non-Affine Extensions of the Raychaudhuri Equation in the K-essence Framework

Samit Ganguly, Goutam Manna, Debashis Gangopadhyay +2

We present a new avenue of the Raychaudhuri Equation (RE) by introducing a non-affine parametrization within the k-essence framework. This modification accounts for non-geodesic fl…

cond-mat.stat-mech2025★ 2 cited

Brownian-motion approach to statistical mechanics: Langevin equations, fluctuations, and timescales

Sushanta Dattagupta, Aritra Ghosh

We briefly review the problem of Brownian motion and describe some intriguing facets. The problem is first treated in its original form as enunciated by Einstein, Langevin, and oth…

gr-qc2024★ 3 cited

On the Field Theoretical Description of an Alternative Model to Generalized Chaplygin Gas and its Thermodynamic Behaviour

Tamal Mukhopadhyay, Banadipa Chakraborty, Ujjal Debnath +1

This paper investigates a newly proposed fluid description of dark energy within the framework of the late-time accelerated expansion of the universe. Our primary objective is to e…

gr-qc2024★ 1 cited

Gravitational waves driven by Holographic dark energy

Sayani Maity, Prabir Rudra

In this paper, we have studied the effects of holographic dark energy on the evolution of gravitational waves. The background evolution of gravitational waves in a flat FRW univers…

cond-mat.mes-hall2024★ 6 cited

Stochastic thermodynamics and the Ericsson nano engine -- Efficiency from equilibrium results

Jasleen Kaur, Aritra Ghosh, Sushanta Dattagupta +2

In this work, we study an Ericsson cycle whose working substance is a charged (quantum) oscillator in a magnetic field that is coupled to a heat bath. The resulting quantum Langevi…

gr-qc2024★ 4 cited

Reconstructions of Einstein-Aether Gravity from Barrow Agegraphic and New Barrow Agegraphic Dark Energy models: Examinations and Observational Limits

Banadipa Chakraborty, Tamal Mukhopadhyay, Anamika Kotal +1

We present a comprehensive investigation exploring the theoretical framework of Einstein-Aether gravity theory when combined with two modified cosmological paradigms: the Barrow Ag…

cond-mat.dis-nn2024★ 1 cited

Quantum transport under oscillatory drive with disordered amplitude

Vatsana Tiwari, Sushanta Dattagupta, Devendra Singh Bhakuni +1

We investigate the dynamics of non-interacting particles in a one-dimensional tight-binding chain in the presence of an electric field with random amplitude drawn from a Gaussian d…

gr-qc2024★ 9 cited

Reconstructions of $f (P)$ and $f (Q)$ gravity models from $(m, n)$ -type Barrow Holographic Dark Energy: Analysis and Observational Constraints

Tamal Mukhopadhyay, Banadipa Chakraborty, Anamika Kotal +1

In this research, we have reconstructed the extended $f (P)$ cubic gravity and symmetric $f (Q)$ teleparallel gravity from the $(m, n)$ -type Barrow Holographic Dar…

gr-qc2024★ 6 cited

Form Invariance of Raychaudhuri equation in the presence of Inflaton-type fields

Arijit Panda, Debashis Gangopadhyay, Goutam Manna

We show that the Raychaudhuri equation remains form invariant for certain solutions of scalar fields $ϕ$ whose Lagrangian is non-canonical and of the form $\mathcal{L}(X,ϕ)=-V(ϕ)F(…

quant-ph2024★ 2 cited

Weak-coupling limits of the quantum Langevin equation for an oscillator

Aritra Ghosh, Sushanta Dattagupta

The quantum Langevin equation as obtained from the independent-oscillator model describes a strong-coupling situation, devoid of the Born-Markov approximation that is employed in t…

astro-ph.CO2024★ 8 cited

Constraining Cosmological Parameters with Viscous Modified Chaplygin Gas and Generalized Cosmic Chaplygin Gas Models in Horava-Lifshitz Gravity: Utilizing Late-time Datasets

Sayani Maity, Himanshu Chaudhary, Ujjal Debnath +2

This study examines accelerated cosmic expansion using the Viscous Modified Chaplygin Gas (VMMG) and Generalized Cosmic Chaplygin Gas (GCCM) within Horava-Lifshitz gravity. Our aim…

gr-qc2024★ 5 cited

NEC violation in $f (R ˉ, T ˉ)$ gravity in the context of a non-canonical theory via modified Raychaudhuri equation

Arijit Panda, Debashis Gangopadhyay, Goutam Manna

In this work, we develop the Raychaudhuri equation in $f (R ˉ, T ˉ)$ gravity in the setting of a non-canonical theory, namely K-essence theory. We solve the modified Raychaud…

cond-mat.stat-mech2023★ 10 cited

Independent-oscillator model and the quantum Langevin equation for an oscillator: A review

Aritra Ghosh, Malay Bandyopadhyay, Sushanta Dattagupta +1

This review provides a brief and quick introduction to the quantum Langevin equation for an oscillator, while focusing on the steady-state thermodynamic aspects. A derivation of th…

gr-qc2021★ 3 cited

An accelerated universe with negative equation of state parameter in Inhomogeneous Cosmology with $k$ -essence scalar field

Somnath Mukherjee, Debashis Gangopadhyay

We obtain a scaling relation for spherically symmetric k-essence scalar fields $ϕ (r, t)$ for an inhomogeneous cosmology with the Lemaitre-Tolman- Bondi (LTB) metric. We show that th…

astro-ph.HE2019★ 7 cited

Multiwavelength analysis of low surface brightness galaxies to study possible dark matter signature

Pooja Bhattacharjee, Pratik Majumdar, Mousumi Das +3

Low Surface Brightness (LSB) galaxies have very diffuse, low surface density stellar disks which appear faint in optical images. They are very rich in neutral hydrogen (HI) gas, wh…

gr-qc2016★ 5 cited

A Scaling Relation in Inhomogeneous Cosmology with k-essence scalar fields

Debashis Gangopadhyay, Somnath Mukherjee