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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

From quantum to classical instability in relativistic stars

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Landulfo, Andre G. S. [1] ; Lima, William C. C. [2] ; Matsas, George E. A. [2] ; Vanzella, Daniel A. T. [3]
Total Authors: 4
[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Sao Paulo - Brazil
[2] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review D; v. 91, n. 2 JAN 7 2015.
Web of Science Citations: 5

It has been shown that gravitational fields produced by realistic classical-matter distributions can force quantum vacuum fluctuations of some nonminimally coupled free scalar fields to undergo a phase of exponential growth. The consequences of this unstable phase for the background spacetime have not been addressed so far due to known difficulties concerning backreaction in semiclassical gravity. It seems reasonable to believe, however, that the quantum fluctuations will ``classicalize{''} when they become large enough, after which backreaction can be treated in the general-relativistic context. Here we investigate the emergence of a classical regime out of the quantum field evolution during the unstable phase. By studying the appearance of classical correlations and loss of quantum coherence, we show that by the time backreaction becomes important the system already behaves classically. Consequently, the gravity-induced instability leads naturally to initial conditions for the eventual classical description of the backreaction. Our results give support to previous analyses which treat classically the instability of scalar fields in the spacetime of relativistic stars, regardless of whether the instability is triggered by classical or quantum perturbations. (AU)

FAPESP's process: 08/57856-6 - National Institute of Science and Technology - Quantum Information
Grantee:Amir Ordacgi Caldeira
Support type: Research Projects - Thematic Grants
FAPESP's process: 07/55449-1 - Physics in curved spacetimes
Grantee:George Emanuel Avraam Matsas
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/00737-0 - Quantum information and relativity theory
Grantee:William Couto Corrêa de Lima
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/12165-4 - Quantum phenomena in curved spacetimes
Grantee:Daniel Augusto Turolla Vanzella
Support type: Regular Research Grants