The effect of electromagnetic radiation birefringence in the field of a relativistically rotating pulsar or magnetar within the framework of vacuum nonlinear electrodynamic (2505.18689v1)

Abstract: Within the framework of the parameterized post-Maxwellian vacuum electrodynamics, the propagation of an X-ray or gamma-ray pulse through the electromagnetic field of a relativistically rotating pulsar is studied. Expressions are obtained for the trajectory of this pulse and the law The effect of electromagnetic radiation birefringence in the field of a relativistically rotating pulsar or magnetar within the framework of vacuum nonlinear electrodynamicsof its motion from the point ${\bf r}_s={x_s,y_s,z_s},$ where an X-ray or gamma-ray burst occurs at time $t=t_s$ to the point ${\bf r}_d={x_s,y_s,z_d},$ where the detector of this radiation is located. In the case when the post-Maxwellian parameters of the theory differ, $\eta_1\neq\eta_2$, the time of nonlinear electrodynamic delay of electromagnetic signals transported by different normal modes is calculated. The change in the polarization state of the X-ray or gamma-ray pulse after passing through the electromagnetic field of the relativistically rotating pulsar is analyzed.