Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inhomogeneity-induced variance of cosmological parameters   Modern cosmology relies on the assumption of large-scale isotropy and
homogeneity of the Universe. However, locally the Universe is inhomogeneous and
anisotropic. So, how can local measurements (at the 100 Mpc scale) be used to
determine global cosmological parameters (defined at the 10 Gpc scale)? We use
Buchert's averaging formalism and determine a set of locally averaged
cosmological parameters in the context of the flat Lambda cold dark matter
model. We calculate their ensemble means (i.e. their global values) and
variances (i.e. their cosmic variances). We apply our results to typical survey
geometries and focus on the study of the effects of local fluctuations of the
curvature parameter. By this means we show, that in the linear regime
cosmological backreaction and averaging can be reformulated as the issue of
cosmic variance. The cosmic variance is found largest for the curvature
parameter and discuss some of its consequences. We further propose to use the
observed variance of cosmological parameters to measure the growth factor.
[abbreviated]

10
The categories of this paper are: q-bio
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an