Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Einstein's signature in cosmological large-scale structure   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.

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The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph