LOSS OF COHERENCE IN MULTIDIMENSIONAL MINISUPERSPACES

被引：13

作者：

GANGUI, A ^{[1
]}

MAZZITELLI, FD ^{[1
]}

CASTAGNINO, MA ^{[1
]}

机构：

[1] UNIV BUENOS AIRES,FAC CIENCIAS EXACTAS & NAT,DEPT FIS,RA-1428 BUENOS AIRES,ARGENTINA

来源：

PHYSICAL REVIEW D | 1991年 / 43卷 / 06期

关键词：

D O I：

10.1103/PhysRevD.43.1853

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In the semiclassical limit of quantum gravity, solutions to the Wheeler-DeWitt equation involve several WKB components. In order to reach the adequate classical limit these contributions should not interfere. We show here that this is in general the case. We work with a general minisuperspace model with perturbations and we construct the reduced density matrix rho approximately (g(A),g'(A)) by tracing out all the nonrelevant modes of the environment. It turns out that not only are the off-diagonal terms of rho approximately (g(A),g'(A)) strongly suppressed but the quantum contributions to rho approximately (g(A),g(A)) due to interference between different semiclassical solutions also vanish. As an example we discuss the particular case of the Kantowski-Sachs cosmological model.

引用

页码：1853 / 1858

页数：6

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