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What is Quantum Coherence and Timelike Curves about?

This paper discusses quantum field theory on spacetimes that contain closed timelike curves. Previous calculations have shown the S-matrix appears non-unitary for interacting fields in these spacetimes. The paper argues this is due to loss of quantum coherence from part of the quantum state circulating on closed timelike curves without being measured at infinity. A prescription is given to calculate a superscattering matrix $ for spacetimes that can be analytically continued to a Euclidean metric. An exampl

Author

Kaustubh

Language

EN