38 citations · 111 across the 15 of their papers we have counts for
10 papers · 1 filter
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…
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 (…
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…
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…
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…