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- W1966195911 abstract "Using the semiclassical Einstein equations, we study the spatially homogeneous perturbations of a spatially flat de Sitter metric arising from fluctuations of a scalar quantum field about the Bunch-Davies vacuum state. The exact solution for the metric perturbation in the linear approzimation is obtained in terms of its Laplace transform, and analyzed for late times and arbitrary initial conditions. The results indicate the existence of only two undamped modes: (i) a “neutrally stable” mode, which derives from a spatial coordinate re-scaling symmetry in flat, Robertson-Walker space-times, and (ii) an unstable but unphysical “ghost” mode with a typical time scale mP−1 = G, which is related to the Landau ghost of the underlying quantum field theory. We show how to remove the latter mode by a restriction on the initial data. The existence of any physical instability in this spatially homogeneous system has been ruled out." @default.
- W1966195911 created "2016-06-24" @default.
- W1966195911 creator A5007922633 @default.
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- W1966195911 date "1992-01-01" @default.
- W1966195911 modified "2023-09-27" @default.
- W1966195911 title "The stability of de Sitter space with a scalar quantum field (II). The linear analysis" @default.
- W1966195911 cites W1984726225 @default.
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- W1966195911 doi "https://doi.org/10.1016/0550-3213(92)90535-j" @default.
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