359 citations · 2k across the 45 of their papers we have counts for
45 papers
Probing Axion-Photon conversion via circular polarization imprints in the CMB -mode observations
Ashu Kushwaha, Rajeev Kumar Jain
In the presence of a background magnetic field, axions or axion-like particles (ALPs) can be resonantly converted to photons when their mass is nearly equal to the effective photon…
Inflationary trispectrum of gauge fields from scalar and tensor exchanges
P. Jishnu Sai, S. R. Haridev, Rajeev Kumar Jain
In this paper, we compute the inflationary trispectrum of primordial gauge fields generated through the scalar and tensor exchanges in models with spectator gauge fields whi…
Constraining circular polarization of high-frequency gravitational waves with CMB
Ashu Kushwaha, Rajeev Kumar Jain
Circular polarization in the cosmic microwave background (CMB) offers a promising probe of the parity-violating physics of the early universe. In this paper, we propose a novel met…
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. To…
Maximal chirality transfer in the photon-graviton conversion in the early universe
Ashu Kushwaha, Rajeev Kumar Jain
While photons and gravitons do not interact significantly, photons can be converted to gravitons in a background magnetic field -- a phenomenon known as the Gertsenshtein effect. I…
Memory burden effect mimics reheating signatures on SGWB from ultra-low mass PBH domination
Nilanjandev Bhaumik, Md Riajul Haque, Rajeev Kumar Jain +1
Ultra-low mass primordial black holes (PBH), briefly dominating the expansion of the universe, would leave detectable imprints in the secondary stochastic gravitational wave backgr…