Inhomogeneity-induced variance of cosmological parameters

Wiegand A, Schwarz D (2012)
Astronomy and Astrophysics 538: A147.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
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]
Stichworte
Cosmology and Extragalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc)
Erscheinungsjahr
2012
Zeitschriftentitel
Astronomy and Astrophysics
Band
538
Art.-Nr.
A147
ISSN
0004-6361
Page URI
https://pub.uni-bielefeld.de/record/2383378

Zitieren

Wiegand A, Schwarz D. Inhomogeneity-induced variance of cosmological parameters. Astronomy and Astrophysics. 2012;538: A147.
Wiegand, A., & Schwarz, D. (2012). Inhomogeneity-induced variance of cosmological parameters. Astronomy and Astrophysics, 538, A147. https://doi.org/10.1051/0004-6361/201118137
Wiegand, A., and Schwarz, D. (2012). Inhomogeneity-induced variance of cosmological parameters. Astronomy and Astrophysics 538:A147.
Wiegand, A., & Schwarz, D., 2012. Inhomogeneity-induced variance of cosmological parameters. Astronomy and Astrophysics, 538: A147.
A. Wiegand and D. Schwarz, “Inhomogeneity-induced variance of cosmological parameters”, Astronomy and Astrophysics, vol. 538, 2012, : A147.
Wiegand, A., Schwarz, D.: Inhomogeneity-induced variance of cosmological parameters. Astronomy and Astrophysics. 538, : A147 (2012).
Wiegand, Alexander, and Schwarz, Dominik. “Inhomogeneity-induced variance of cosmological parameters”. Astronomy and Astrophysics 538 (2012): A147.
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2021-11-30T13:21:46Z
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arXiv: 1109.4142

Inspire: 927943

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