Nonlinear vacuum electrodynamics birefringence effect in a pulsar’s strong magnetic field

The motion of x-ray and gamma-ray pulses in the magnetic field of the pulsar, taking into account the nonlinearity of electrodynamics in a vacuum, is calculated. It is shown that in these conditions, each pulse propagates in the form of two orthogonally polarized normal waves with different speeds. The propagation time from the common source in the pulsars’ magnetosphere to a remote observer is calculated for each mode. An experiment to measure the delay time of one pulse with respect to the other is proposed.