The relativistic tunneling flight time may be superluminal, but it does not imply superluminal signaling

@article{Dumont2020TheRT,
  title={The relativistic tunneling flight time may be superluminal, but it does not imply superluminal signaling},
  author={Randall S Dumont and Tom Rivlin and Eli Pollak},
  journal={New Journal of Physics},
  year={2020},
  volume={22},
  pages={093060}
}
Wavepacket tunneling, in the relativistic limit, is studied via solutions to the Dirac equation for a square barrier potential. Specifically, the arrival time distribution (the time-dependent flux) is computed for wavepackets initiated far away from the barrier, and whose momentum is well below the threshold for above-barrier transmission. The resulting distributions exhibit peaks at shorter times than those of photons with the same initial wavepacket transmitting through a vacuum. However… Expand
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