26 citations · 48 across the 5 of their papers we have counts for
5 papers
Suppressed Magnetogenesis from Ultralight Dark Matter due to Finite Conductivity
Ramkishor Sharma, Samarth Majumdar, Divya Sachdeva
Recently, a mechanism for generating astrophysically relevant magnetic fields via ultralight pseudoscalar dark matter, through the coupling term in t…
Lattice simulations of axion-U(1) inflation: gravitational waves, magnetic fields, and scalar statistics
Ramkishor Sharma, Axel Brandenburg, Kandaswamy Subramanian +1
We numerically study axion-U(1) inflation, focusing on the regime where the coupling between axions and gauge fields results in significant backreaction from the amplified gauge fi…
Magnetogenesis from axion-SU(2) inflation
Axel Brandenburg, Oksana Iarygina, Evangelos I. Sfakianakis +1
We describe a novel proposal for inflationary magnetogenesis by identifying the non-Abelian sector of Spectator Chromo Natural Inflation (SCNI) with the sector…
Inverse Gertsenshtein effect as a probe of high-frequency gravitational waves
Yutong He, Sambit K. Giri, Ramkishor Sharma +2
We apply the inverse Gertsenshtein effect, i.e., the graviton-photon conversion in the presence of a magnetic field, to constrain high-frequency gravitational waves (HFGWs). Using…
Backreaction of axion-SU(2) dynamics during inflation
Oksana Iarygina, Evangelos I. Sfakianakis, Ramkishor Sharma +1
We consider the effects of backreaction on axion-SU(2) dynamics during inflation. We use the linear evolution equations for the gauge field modes and compute their backreaction on…