94 citations · 199 across the 13 of their papers we have counts for
14 papers
Sub-Horizon and Quasi-Static Approximations in Interacting Dark Sector Models Involving Scalar Field Dark Energy
Priyanka Saha, Sharvari Nadkarni-Ghosh, Kaushik bhattacharya
We investigate the validity of the sub-horizon approximation (SHA) and quasi-static approximation (QSA) for linear matter perturbations in interacting scalar-field dark-energy mode…
Non-linear evolution in gravity: perturbative modelling of the Chameleon mechanism
Sharvari Nadkarni-Ghosh, Tanush Reddy Vaka
We investigate the non-linear evolution of matter perturbations in models with the Chameleon screening mechanism. The novel feature of our investigation is an iterative solu…
Non-linear density-velocity dynamics in gravity from spherical collapse
Sharvari Nadkarni-Ghosh, Sandip Chowdhury
We investigate the joint density-velocity evolution in gravity using smooth, compensated spherical top-hats as a proxy for the non-linear regime. Using the Hu-Sawicki model…
One-point probability distribution function from spherical collapse: Early Dark Energy (EDE) vs. CDM
Ankush Mandal, Sharvari Nadkarni-Ghosh
We compute the one-point PDF of an initially Gaussian dark matter density field using spherical collapse (SC). We compare the results to other forms available in the literature and…
The Einstein-Boltzmann equations revisited
Sharvari Nadkarni-Ghosh, Alexandre Refregier
The linear Einstein-Boltzmann equations describe the evolution of perturbations in the universe and its numerical solutions play a central role in cosmology. We revisit this system…
Rings of non-spherical, axisymmetric bodies
Akash Gupta, Sharvari Nadkarni-Ghosh, Ishan Sharma
We investigate the dynamical behavior of rings around bodies whose shapes depart considerably from that of a sphere. To this end, we have developed a new self-gravitating discrete…
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…
Evolution of axis ratios from phase space dynamics of triaxial collapse
Sharvari Nadkarni-Ghosh, Bhaskar Arya
We investigate the evolution of axis ratios of triaxial haloes using the phase space description of triaxial collapse. In this formulation, the evolution of the triaxial ellipsoid…
Phase Space dynamics of triaxial collapse: Joint density-velocity evolution
Sharvari Nadkarni-Ghosh, Akshat Singhal
We investigate the dynamics of triaxial collapse in terms of eigenvalues of the deformation tensor, the velocity derivative tensor and the gravity Hessian. Using the Bond-Myers mod…
Dipole anisotropy in sky brightness and source count distribution in radio NVSS data
Prabhakar Tiwari, Rahul Kothari, Abhishek Naskar +2
We study the dipole anisotropy in number counts and flux density weighted number counts {or sky brightness} in the NRAO VLA Sky Survey (NVSS) data. The dipole anisotropy is expecte…
Stability analysis of fluid flows using Lagrangian Perturbation Theory (LPT): application to the plane Couette flow
Sharvari Nadkarni-Ghosh, Jayanta K. Bhattacharjee
We present a new application of Lagrangian Perturbation Theory (LPT): the stability analysis of fluid flows. As a test case that demonstrates the framework we focus on the plane Co…
Modelling non-linear evolution using Lagrangian Perturbation Theory (LPT) re-expansions
Sharvari Nadkarni-Ghosh, David F. Chernoff
We present a new method to calculate formation of cosmological structure in the Newtonian limit. The method is based on Lagrangian perturbation theory plus two key theoretical exte…
Non-linear density-velocity divergence relation from phase space dynamics
Sharvari Nadkarni-Ghosh
We obtain the non-linear relation between cosmological density and velocity perturbations by examining their joint dynamics in a two dimensional density-velocity divergence phase s…
Extending the domain of validity of the Lagrangian approximation
Sharvari Nadkarni-Ghosh, David F. Chernoff
We investigate convergence of Lagrangian Perturbation Theory (LPT) by analyzing the model problem of a spherical homogeneous top-hat in an Einstein-deSitter background cosmology. W…