Is there Unruh radiation

@article{Ford2006IsTU,
  title={Is there Unruh radiation},
  author={George W. Ford and R. F. O’Connell},
  journal={Physics Letters A},
  year={2006},
  volume={350},
  pages={17-26}
}
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Near-horizon aspects of acceleration radiation by free fall of an atom into a black hole
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