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- W3100754100 abstract "We show how the non-linearity of general relativity generates a characteristic non-Gaussian signal in cosmological large-scale structure that we calculate at all perturbative orders in a large scale limit. Newtonian gravity and general relativity provide complementary theoretical frameworks for modelling large-scale structure in $Lambda$CDM cosmology; a relativistic approach is essential to determine initial conditions which can then be used in Newtonian simulations studying the non-linear evolution of the matter density. Most inflationary models in the very early universe predict an almost Gaussian distribution for the primordial metric perturbation, $zeta$. However, we argue that it is the Ricci curvature of comoving-orthogonal spatial hypersurfaces, $R$, that drives structure formation at large scales. We show how the non-linear relation between the spatial curvature, $R$, and the metric perturbation, $zeta$, translates into a specific non-Gaussian contribution to the initial comoving matter density that we calculate for the simple case of an initially Gaussian $zeta$. Our analysis shows the non-linear signature of Einstein's gravity in large-scale structure." @default.
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- W3100754100 date "2014-09-26" @default.
- W3100754100 modified "2023-10-03" @default.
- W3100754100 title "EINSTEIN'S SIGNATURE IN COSMOLOGICAL LARGE-SCALE STRUCTURE" @default.
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- W3100754100 doi "https://doi.org/10.1088/2041-8205/794/1/l11" @default.
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