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astro-ph.CO2025
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…
hep-th2025★ 1 cited
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…
astro-ph.CO2025
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…