UNITARITY RESTORATION IN THE PRESENCE OF CLOSED TIME-LIKE CURVES

被引:11
作者
ANDERSON, A
机构
[1] ISAAC NEWTON INST,CAMBRIDGE CB3 0EH,ENGLAND
[2] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND
来源
PHYSICAL REVIEW D | 1995年 / 51卷 / 10期
关键词
D O I
10.1103/PhysRevD.51.5707
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A proposal is made for a mathematically unambiguous treatment of evolution in the presence of closed timelike curves. In contrast to other proposals for handling the naively nonunitary evolution that is often present in such situations, this proposal is causal, linear in the initial density matrix, and preserves probability. It provides a physically reasonable interpretation of invertible nonunitary evolution by redefining the final Hilbert space so that the evolution is unitary or equivalently by removing the nonunitary part of the evolution operator using a polar decomposition. © 1995 The American Physical Society.
引用
收藏
页码:5707 / 5715
页数:9
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