Utkarsh Kumar

activity

20182026

most citedCosmology with the Laser Interferometer Space Antenna

359 citations · 476 across the 17 of their papers we have counts for

collaborators

Showing 2026Show all

2 papers · 1 filter

physics.gen-ph2026

Supernova Time Dilation in Hybrid Expansion-Tired-Light Cosmologies

Rajendra P. Gupta, Nikolaos Samaras, Utkarsh Kumar

Dark Energy Survey has shown that the emission light curve widths $Δ t_{em}$ of supernovae increase to $Δ t_{obs}$ , obeying $Δ t_{obs} /Δ t_{em} = (1 + z)^{b}$ with $b=1.003\p…

astro-ph.CO2026

Primordial Black Hole from Tensor-induced Density Fluctuation: First-order Phase Transitions and Domain Walls

Utkarsh Kumar, Anish Ghoshal

Gravitational waves generated by violent processes in the early Universe necessarily couple to scalar perturbations beyond linear order. We show that tensor perturbations produced…