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• W1971749097 abstract "We discuss the stability of semiclassical gravity solutions with respect to small quantum corrections by considering the quantum fluctuations of the metric perturbations around the semiclassical solution. We call the attention to the role played by the symmetrized 2-point quantum correlation function for the metric perturbations, which can be naturally decomposed into two separate contributions: intrinsic and induced fluctuations. We show that traditional criteria on the stability of semiclassical gravity are incomplete because these criteria based on the linearized semiclassical Einstein equation can only provide information on the expectation value and the intrinsic fluctuations of the metric perturbations. By contrast, the framework of stochastic semiclassical gravity provides a more complete and accurate criterion because it contains information on the induced fluctuations as well. The Einstein–Langevin equation therein contains a stochastic source characterized by the noise kernel (the symmetrized 2-point quantum correlation function of the stress tensor operator) and yields stochastic correlation functions for the metric perturbations which agree, to leading order in the large N limit, with the quantum correlation functions of the theory of gravity interacting with N matter fields. These points are illustrated with the example of Minkowski space-time as a solution to the semiclassical Einstein equation, which is found to be stable under both intrinsic and induced fluctuations." @default.
• W1971749097 created "2016-06-24" @default.
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• W1971749097 date "2004-03-01" @default.
• W1971749097 modified "2023-09-25" @default.
• W1971749097 title "Stability of Semiclassical Gravity Solutions with Respect to Quantum Metric Fluctuations" @default.
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• W1971749097 doi "https://doi.org/10.1023/b:ijtp.0000048173.09964.d2" @default.
• W1971749097 hasPublicationYear "2004" @default.
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