Thermal photon emission from quark-gluon plasma: 1+1D magnetohydrodynamics results*

Abstract We investigate thermal photon production in the quark-gluon plasma (QGP) under strong magnetic fields using a magnetohydrodynamic (MHD) framework. We employ relativistic ideal fluid dynamics under the non-resistive approximation by adopting the Bjorken flow model with power-law decaying magnetic fields , span> a controls the decay rate, , and σ characterizes the initial field strength. The resulting QGP temperature evolution exhibits distinct a - and σ -dependent behaviors. Thermal photon production rates are calculated for three dominant processes: Compton scattering with annihilation (C+A), bremsstrahlung (Brems), and annihilation with additional scattering (A+S). These rates are integrated over the space-time volume to obtain the photon transverse momentum spectrum. Our results demonstrate that increasing a enhances photon yields across all , with (super-fast decay) providing an upper bound. For , a larger σ suppresses yields through accelerated cooling, whereas for , a larger σ enhances yields via prolonged thermal emission. Low- photons receive significant contributions from all QGP evolution stages, while high- photons originate predominantly from early times. The central rapidity region dominates the total yield. This work extends the photon yield studies to the MHD regime under strong magnetic fields, clarifying the magnetic field effects on QGP electromagnetic signatures and establishing foundations for future investigations of magnetization and dissipative phenomena.