38 citations · 111 across the 15 of their papers we have counts for
16 papers
Partially Thermalized eV-Scale Sterile Neutrinos in Dynamical Dark Energy and Non-Flat Cosmologies
Gopal Kashyap, Kanhaiya Lal Pandey
We investigate cosmological constraints on a neutrino framework containing an additional partially thermalized, eV-scale sterile neutrino alongside the three active species…
Operator-Level Quantum-Classical Correspondence in Relativistic Quantum Theory and Curved Spacetime
Pankaj Sheoran, Gopal Kashyap, Sanjay Siwach
In a recent work \cite{Shaikh:2026nsi}, it was shown that for a non-relativistic particle, the operator equations of motion can be cast in the same differential form as Newton's eq…
Directional Tests of the Cosmic Distance Duality Relation using Pantheon+ and BAO
Pushty Shrimankar, Gopal Kashyap
We present a model-independent test of anisotropy in the cosmic distance duality relation (CDDR), , using the Pantheon+ type Ia supernova sample and baryon acousti…
Unimodular Diffusion and Interacting Vacuum Cosmology
Gopal Kashyap, Naveen K. Singh
We investigate the correspondence between unimodular diffusion cosmology and interacting dark sector models at the background and linear perturbation levels. In the diffusion frame…
Constraints on Axion-Photon Mixing from Fast Radio Burst Dispersion Measures
Gunalan Muthusami, Gopal Kashyap
Fast radio bursts (FRBs) offer a powerful probe of the ionized Universe through their dispersion measures (DM). While a significant fraction of the DM arises from the intergalactic…
Matter Dipole and Hubble Tension due to Large Wavelength Perturbations
Gopal Kashyap, Naveen K. Singh, Pankaj Jain
We theoretically analyze the dipole anisotropy observed in the quasar distribution from the CatWISE2020 catalog. The catalog data shows a peak around , suggesting the p…
Stability of Neutron Star and Cosmological Constant
Naveen K. Singh, Gopal Kashyap
We derive the equation for pressure within a neutron star, taking into account a non-zero cosmological constant (). We then examine the stability of the neutron star's equilibri…
Unimodular Theory of Gravity in Light of the Latest Cosmological Data
Naveen K. Singh, Gopal Kashyap
The unimodular theory of gravity is an alternative perspective to traditional Einstein's general relativity and opens new possibilities for exploring its implications in cosmology.…
Dipole Anisotropy in Gravitational Wave Source Distribution
Gopal Kashyap, Naveen K. Singh, Khun Sang Phukon +2
Our local motion with respect to the cosmic frame of rest is believed to be dominantly responsible for the observed dipole anisotropy in the Cosmic Microwave Background Radiation (…
Cosmological Dark Matter in a Conformal Model
Prasenjit Sanyal, Alekha C. Nayak, Gopal Kashyap +1
We study the collider, astrophysical and cosmological constraints on the dark matter sector of a conformal model within the framework of both the freeze out as well as the freeze i…
Probing statistical isotropy of cosmological radio sources using SKA
Shamik Ghosh, Pankaj Jain, Gopal Kashyap +3
There currently exist many observations which are not consistent with the cosmological principle. We review these observations with a particular emphasis on those relevant for Squa…
Non-relativistic matter and Dark energy in a quantum conformal model
Pankaj Jain, Gopal Kashyap, Subhadip Mitra
We consider a generalization of the standard model which respects quantum conformal invariance. This model leads to identically zero vacuum energy. We show how non-relativistic mat…
Imprint of Inhomogeneous and Anisotropic Primordial Power Spectrum on CMB Polarization
Rahul Kothari, Shamik Ghosh, Pranati K. Rath +2
We consider an inhomogeneous model and independently an anisotropic model of primordial power spectrum in order to describe the observed hemispherical anisotropy in Cosmic Microwav…
The fine tuning of the cosmological constant in a conformal model
Pankaj Jain, Gopal Kashyap, Subhadip Mitra
We consider a conformal model involving two real scalar fields in which the conformal symmetry is broken by a soft mechanism and is not anomalous. One of these scalar fields is rep…
Relating the cosmological constant and slow roll to conformal symmetry breaking
Pankaj Jain, Gopal Kashyap
We show that a theory with conformal invariance, which is explicitly broken by small terms, provides a solution to the fine tuning problem of the cosmological constant. In the abse…
Cosmological Implications of Unimodular Gravity
Pankaj Jain, Atul Jaiswal, Purnendu Karmakar +2
We consider a model of gravity and matter fields which is invariant only under unimodular general coordinate transformations (GCT). The determinant of the metric is treated as a se…