Simple Quantum Systems in Spacetimes with Closed Timelike Curves
arXiv:hep-th/9207076 · doi:10.1103/PhysRevD.46.4470
Abstract
Three simple examples illustrate properties of path integral amplitudes in fixed background spacetimes with closed timelike curves: non-relativistic potential scattering in the Born approximation is non-unitary, but both an example with hard spheres and the exact solution of a totally discrete model are unitary.
15 pages, CALT-68-1805
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