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Quantum Fields, Geometric Fluctuations, and the Structure of Spacetime
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Quantum fluctuations of the vacuum stress-energy tensor are highly non-Gaussian, and can have unexpectedly large effects on spacetime geometry. In this paper, we study a two-dimensional dilaton gravity model coupled to a conformal field, in which the distribution of vacuum fluctuations is well understood. In this model, the fluctuations of the matter field are responsible for the fluctuations of the geometry itself. By analyzing the geodesic deviation in this model, we show that a pencil of massive particles propagating on this fuzzy spacetime eventually converges and collapses. This is consistent with our earlier analysis of null geodesics in [Phys. Rev. Lett.\ 107, 021303 (2011)].
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Probability Distribution for Vacuum Energy Flux Fluctuations in Two Spacetime Dimensions
Time-averaged vacuum energy flux in 2D CFT follows a symmetric variance-gamma distribution, and the joint flux-energy density distribution is explicitly constructed.
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