72 citations · 285 across the 29 of their papers we have counts for
10 papers · 1 filter
Gamma Rays Bursts: A Viable Cosmological Probe?
Darshan Kumar, Nisha Rani, Deepak Jain +2
In this work, our focus is on exploring the potential of current GRB measurements to provide reliable constraints on cosmological model parameters at high redshift. This work is di…
Constraints on the Transition Redshift using Hubble Phase Space Portrait
Darshan Kumar, Deepak Jain, Shobhit Mahajan +2
One of the most significant discoveries in modern cosmology is that the universe is currently in a phase of accelerated expansion after a switch from a decelerated expansion. The r…
A non-parametric test of variability of Type Ia supernovae luminosity and CDDR
Darshan Kumar, Akshay Rana, Deepak Jain +3
The first observational evidence for cosmic acceleration appeared from Type Ia supernovae (SNe Type Ia) Hubble diagram from two different groups. However, the empirical treatment o…
Constraining Cosmological and Galaxy Parameters using Strong Gravitational Lensing Systems
Darshan Kumar, Deepak Jain, Shobhit Mahajan +2
Strong gravitational lensing along with the distance sum rule method can constrain both cosmological parameters as well as density profiles of galaxies without assuming any fiducia…
Bounds on graviton mass using weak lensing and SZ effect in galaxy clusters
Akshay Rana, Deepak Jain, Shobhit Mahajan +1
In General Relativity (GR), the graviton is massless. However, a common feature in several theoretical alternatives of GR is a non-zero mass for the graviton. These theories can be…
Probing the cosmic distance duality relation using time delay lenses
Akshay Rana, Deepak Jain, Shobhit Mahajan +2
The construction of the cosmic distance-duality relation (CDDR) has been widely studied. However, its consistency with various new observables remains a topic of interest. We prese…
Revisiting dark energy models using differential ages of galaxies
Nisha Rani, Deepak Jain, Shobhit Mahajan +2
In this work, we use a test based on the differential ages of galaxies for distinguishing the dark energy models. As proposed by Jimenez and Loeb, relative ages of galaxies can be…
Constraining cosmic curvature by using age of galaxies and gravitational lenses
Akshay Rana, Deepak Jain, Shobhit Mahajan +1
We use two model-independent methods to constrain the curvature of the universe. In the first method, we study the evolution of the curvature parameter () with redshift by u…
Revisiting the distance duality relation using a non-parametric regression method
Akshay Rana, Deepak Jain, Shobhit Mahajan +1
The interdependence of luminosity distance, and angular diameter distance, given by the distance duality relation (DDR) is very significant in observational cosmology.…
Reanalyzing the upper limit on the tensor-to-scalar perturbation ratio r_T in a quartic potential inflationary model
R. Kabir, A. Mukherjee, D. Lohiya
We study the polynomial chaotic inflation model with a single scalar field in a double well quartic potential which has recently been shown to be consistent with Planck data. In pa…