CMB seen through random Swiss Cheese

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http://hdl.handle.net/10138/310152

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Lavinto , M & Räsänen , S 2015 , ' CMB seen through random Swiss Cheese ' , Journal of Cosmology and Astroparticle Physics , no. 10 , 057 . https://doi.org/10.1088/1475-7516/2015/10/057

Title: CMB seen through random Swiss Cheese
Author: Lavinto, Mikko; Räsänen, Syksy
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
Date: 2015-10
Language: eng
Number of pages: 31
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/310152
Abstract: We consider a Swiss Cheese model with a random arrangement of LemaitreTolman-Bondi holes in Lambda CDM cheese. We study two kinds of holes with radius r(b) = 50 h(-1) Mpc, with either an underdense or an overdense centre, called the open and closed case, respectively. We calculate the effect of the holes on the temperature, angular diameter distance and, for the first time in Swiss Cheese models, shear of the CMB. We quantify the systematic shift of the mean and the statistical scatter, and calculate the power spectra. In the open case, the temperature power spectrum is three orders of magnitude below the linear ISW spectrum. It is sensitive to the details of the hole, in the closed case the amplitude is two orders of magnitude smaller. In contrast, the power spectra of the distance and shear are more robust, and agree with perturbation theory and previous Swiss Cheese results. We do not find a statistically significant mean shift in the sky average of the angular diameter distance, and obtain the 95% limit vertical bar Delta D-A/(D) over bar (A)vertical bar less than or similar to 10(-4). We consider the argument that areas of spherical surfaces are nearly unaffected by perturbations, which is often invoked in light propagation calculations. The closed case is consistent with this at 1 sigma, whereas in the open case the probability is only 1.4%.
Subject: gravitational lensing
integrated Sachs-Wolfe effect
cosmological parameters from CMBR
DISTANCE-REDSHIFT RELATION
INHOMOGENEOUS COSMOLOGICAL MODELS
LARGE-SCALE INHOMOGENEITY
BACKGROUND COLD SPOT
GENERAL-RELATIVITY
LIGHT-PROPAGATION
INTERGALACTIC MEDIUM
LUMINOSITY DISTANCE
FRIEDMANN MODELS
NONLINEAR VOIDS
115 Astronomy, Space science
114 Physical sciences
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