72 citations · 206 across the 10 of their papers we have counts for
10 papers
Spectral Chebyshev Approximation of Cosmic Expansion in Gravity
Akshay Rana
We present a numerical framework to study the cosmological background evolution in gravity by employing a \textit{spectral Chebyshev collocation approach}. Unlike standard i…
Testing the Constancy of Type Ia Supernova Luminosities with Gaussian Process
Akshay Rana
Type Ia supernovae (SNe~Ia) are central to studies of cosmic expansion, under the assumption that their absolute magnitude does not evolve with redshift. Even small drifts in…
Examining Temporal Variation of the Fermi Coupling Constant using SNe Ia Light Curves
Akshay Rana, Vedanta Thapar, Hari Prasad S. V. +1
In standard model, the Fermi coupling constant, , sets the strength of electroweak decay. We attempt an approach to constrain the temporal variation of the Fermi coupling cons…
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…
Strong lensing systems and galaxy cluster observations as probe to the cosmic distance duality relation
R. F. L. Holanda, F. S. Lima, Akshay Rana +1
{In this paper, we use large scale structure observations to test the redshift dependence of cosmic distance duality relation (CDDR), }, with $D…
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…
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.…