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Path integrals, density matrices, and information flow with closed timelike curves

Politzer, H. David (1994) Path integrals, density matrices, and information flow with closed timelike curves. Physical Review D, 49 (8). pp. 3981-3989. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:POLprd94

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Abstract

Two formulations of quantum mechanics, inequivalent in the presence of closed timelike curves, are studied in the context of a soluable system. It illustrates how quantum field nonlinearities lead to a breakdown of unitarity, causality, and superposition using a path integral. Deutsch's density matrix approach is causal but typically destroys coherence. For each of these formulations I demonstrate that there are yet further alternatives in prescribing the handling of information flow (inequivalent to previous analyses) that have implications for any system in which unitarity or coherence is not preserved.


Item Type:Article
Additional Information:©1994 The American Physical Society. Received 2 September 1993. The author wishes to thank J. Preskill for his continuing interest, patient explications, probing questions, and constructive criticism. This work was supported in part by the U. S. Department of Energy under Grant No. DE-FG03-92-ER40701.
Subject Keywords:SPACETIMES
Record Number:CaltechAUTHORS:POLprd94
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:POLprd94
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.49.3981
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4399
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Aug 2006
Last Modified:26 Dec 2012 08:59

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