3 papers
astro-ph.CO2026
Early- and Late-Time Modifications to CDM: Implications for the Hubble Tension
Rahul Dhyani, Purba Mukherjee, Arindam Chatterjee +1
We investigate an extension of CDM in which a fraction of cold Dark Matter (DM) decays into invisible dark radiation (DR) around the radiation-matter equality epoch, together w…
gr-qc2026
Dimming of Photon Ring due to Photon-Axion Conversion around Kerr Black Holes
Rahul Dhyani, Sauvik Sen, Indrani Banerjee +2
We investigate photon-axion conversion in the vicinity of rotating Kerr black holes where strong gravity traps photons on near-circular trajectories, effectively enhancing the path…
hep-ph2025
Probing Dark Matter-Electron Interactions in the Cosmic Microwave Background Radiation
Rahul Dhyani, Arnab Paul, Arindam Chatterjee
In this article, we consider Dark Matter (DM) interactions and study the same in the light of the Cosmic Microwave Background Radiation (CMBR) data. In particular, we focus on the…