13 citations · 26 across the 10 of their papers we have counts for
10 papers
Model-Independent Indication for a Localized Anomaly in the Late-Time Expansion History
Shibendu Gupta Choudhury, Purba Mukherjee, Eleonora Di Valentino +1
We investigate the late-time expansion history of the Universe using a model-independent spline reconstruction of cosmological distances based on the latest DESI DR2 baryon acousti…
Beyond CDM with a Logistic RG-like Flow of the Low Redshift Cosmic Evolution
Shibendu Gupta Choudhury, Anjan A Sen
Recent observations hint at possible late-time deviations from CDM. We introduce a minimal phenomenological framework in which the total equation of state follows…
Anchoring the Universe with Characteristic Redshifts using Raychaudhuri Equation Informed Reconstruction Algorithm (REIRA)
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We study the robustness and physical implications of a set of characteristic redshifts that capture key features of the late-time Universe. Using both model-independent reconstruct…
Scalaron dark matter dynamics: effects of Higgs non-minimal coupling to gravity
Shibendu Gupta Choudhury, Koushik Dutta, Deep Ghosh
One of the key features of the -gravity is the embedding of a scalar field, scalaron, into the gravity sector. The scalaron interacts with the Standard Model (SM) matter field…
Towards a Composite Framework for Simultaneous Exploration of New Physics in Background and Perturbed Universe
Shibendu Gupta Choudhury, Purba Mukherjee, Anjan Ananda Sen
We investigate deviations from CDM by independently parameterizing modifications in the background evolution and the growth of structures. The background is characterized by two…
Torsional four-fermion interaction and the Raychaudhuri equation
Shibendu Gupta Choudhury, Sagar Kumar Maity, Amitabha Lahiri
Intrinsic spin of fermions can generate torsion in spacetime. This torsion is a non-propagating field that can be integrated out, leaving an effective non-universal four-fermion in…
Application of the Raychaudhuri Equation in Gravitational Systems
Shibendu Gupta Choudhury
The works reported in this thesis primarily address the application of the Raychaudhuri equation in two intriguing problems in gravitational physics. These problems still lack univ…
Role of a magnetic field in the context of inhomogeneous gravitational collapse
Shibendu Gupta Choudhury
Magnetic fields have been found to have an inherent capability of acting against gravity. An important question posed in the literature is whether presence of a magnetic field can…
Raychaudhuri equation in scalar-tensor theory
Shibendu Gupta Choudhury, Ananda Dasgupta, Narayan Banerjee
Implications of the Raychaudhuri equation in focusing of geodesic congruences are studied in the framework of scalar--tensor theory of gravity. Specifically, we investigate the Bra…
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…