NUMERICAL INVESTIGATION OF THE FINITE SUPERELEMENT METHOD FOR THE 3D ELASTICITY PROBLEMS



Vacuum birefringence at x-ray free-electron lasers

We study the perspectives of measuring the phenomenon of vacuum birefringence predicted by quantum electrodynamics using an x-ray free-electron laser (XFEL) alone.We devise an experimental scheme allowing two consecutive XFEL pulses to collide under a finite angle, and thus act as both pump and probe field for the effect.The signature of vacuum bir

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