# Time travel paradoxes, path integrals, and the many worlds interpretation of quantum mechanics

@article{Everett2004TimeTP,
title={Time travel paradoxes, path integrals, and the many worlds interpretation of quantum mechanics},
author={Allen E. Everett},
journal={Physical Review D},
year={2004},
volume={69},
pages={124023}
}
• A. Everett
• Published 25 June 2004
• Physics
• Physical Review D
We consider two approaches to evading paradoxes in quantum mechanics with closed timelike curves. In a model similar to Politzer's, assuming pure states and using path integrals, we show that the problems of paradoxes and of unitarity violation are related; preserving unitarity avoids paradoxes by modifying the time evolution so that improbable events become certain. Deutsch has argued, using the density matrix, that paradoxes do not occur in the many worlds interpretation.'' We find that in…
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