Quantum coherence and closed timelike curves.

  title={Quantum coherence and closed timelike curves.},
  journal={Physical review. D, Particles and fields},
  volume={52 10},
  • Hawking
  • Published 1995 in Physical review. D, Particles and fields
Various calculations of the S matrix have shown that it seems to be non unitary for interacting fields when there are closed timelike curves. It is argued that this is because there is loss of quantum coherence caused by the fact that part of the quantum state circulates on the closed timelike curves and is not measured at infinity. A prescription is given for calculating the superscattering matrix $ on space times whose parameters can be analytically continued to obtain a Euclidean metric. It… CONTINUE READING
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