Group delay of electromagnetic pulses through multilayer dielectric   mirrors beyond special relativity
  In this Letter, we investigate the group delay of optical pulses through multilayer dielectric mirrors (MDM) combined with gravitational wave (GW). We find that the delay increases linearly with MDM length for the transmitted wave packet, whereas the Hartman effect disappears. Our study provides insight into the nature of both quantum tunnelling and GW. 
Jiang-Tao Liu, Wu Xin, Nian-Hua Liu, Jun Li, and Fu-Hai Su
physics.optics gr-qc