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- W2002070000 abstract "It is shown that under essentially all conditions, the nonlinear classical equations governing gravitation and matter in cosmology have a solution in which far outside the horizon in a suitable gauge the reduced spatial metric (the spatial metric divided by the square of the Robertsonchar21{}Walker scale factor $a$) is time independent, though with an arbitrary dependence on comoving coordinates, and all perturbations to the other metric components and to all matter variables vanish, to leading order in $1/a$. The corrections are of order $1/{a}^{2}$, and are explicitly given for the reduced metric in a multifield model with a general potential. Further, this is the solution that describes the metric and matter produced by single-field inflation. These results justify the use of observed non-Gaussian correlations (or their absence) as a test of theories of single-field inflation, despite our ignorance of the constituents of the Universe while fluctuations are outside the horizon after inflation, as long as graphs with loops can be neglected." @default.
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- W2002070000 date "2008-12-16" @default.
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- W2002070000 title "Non-Gaussian correlations outside the horizon" @default.
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- W2002070000 doi "https://doi.org/10.1103/physrevd.78.123521" @default.
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