Axion-Photon Conversion in Variable-Domain Magnetic Fields and the Highest-Energy Photons from GRB 221009A

Rick Sundar Garai, Tanmoy Kumar, Sourov Roy

We investigate photon-ALP conversion as a simultaneous explanation of the ultra-high-energy photons observed from GRB 221009A by LHAASO and of the $\sim 300$ TeV photon reported by…