3 citations · 3 across the 5 of their papers we have counts for
6 papers
Can Distance Duality Violation Save Late-time Solutions to the Hubble Tension?
Yashi Tiwari, Ujjwal Upadhyay, Shao-Jiang Wang +1
The discrepancy between early- and late-Universe determinations of the Hubble constant may point to physics beyond CDM or to unaccounted-for systematics. Numerous late-time mod…
A Bayesian estimator for peculiar velocity correction in cosmological inference from supernovae data
Ujjwal Upadhyay, Tarun Deep Saini, Shiv K. Sethi
The peculiar motion of the host galaxies introduces bias in estimating cosmological parameters from supernova data. The coherent component of the peculiar motion is usually correct…
Unbiased Bayesian Inference of Peculiar Motions of Galaxies from Type Ia Supernovae Observations
Ujjwal Upadhyay, Tarun Deep Saini, Shiv K. Sethi
The peculiar motions of galaxies are powerful cosmological probes that trace the growth of structures and the distribution of matter in the universe, providing a means to investiga…
Updated Constraints on Infrared Cutoff Models and Implications for Large-Scale CMB Anomalies
Ujjwal Upadhyay, Yashi Tiwari, Tarun Souradeep
The nearly scale-invariant primordial power spectrum provides the standard initial conditions for cosmological perturbations. However, the largest scales remain only weakly constra…
Revisiting Cosmic Distance Duality with Megamasers and DESI DR2 Observations: Model Independent Constraints on Early-Late Calibration
Brijesh Kanodia, Ujjwal Upadhyay, Yashi Tiwari
The Cosmic Distance Duality Relation (CDDR) connects the angular diameter distance () and the luminosity distance () at a given redshift. This fundamental relation holds…
Exploring cosmological imprints of phantom crossing with dynamical dark energy in Horndeski gravity
Yashi Tiwari, Ujjwal Upadhyay, Rajeev Kumar Jain
In the current era of precision cosmology, the persistence of cosmological tensions, most notably the Hubble tension and the tension, challenges the standard CDM model. T…