Cosmological model differentiation through weak gravitational lensing

Author: Antonio C. C. Guimarães

Source: Monthly Notices of the Royal Astronomical Society, Volume 337, Number 2, December 2002 , pp. 631-640(10)

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Abstract:

We investigate the potential of weak gravitational lensing maps to differentiate between distinct cosmological models, considering cosmic variance owing to a limited map extension and the presence of noise. We introduce a measure of the differentiation between two models under a chosen lensing statistics. That enables one to determine in which circumstances (map size and noise level), and for which lensing measures two models can be differentiated at a desired confidence level. As an application, we simulate convergence maps for three cosmological models (SCDM, OCDM, and Lambda

CDM), calculate several lensing analyses for them, and compute the differentiation between the models under these analyses. We use first, second, and higher order statistics, including Minkowski functionals, which provide a complete morphological characterization of the lensing maps. We examine for each lensing measure used how noise affects its description of the convergence, and how this affects its ability to differentiate between cosmological models. Our results confirm the use of weak gravitational lensing as a valuable cosmological tool.

Keywords: gravitational lensing; large-scale structure of Universe

Document Type: Research article

DOI: http://dx.doi.org/10.1046/j.1365-8711.2002.05939.x

Publication date: 2002-12-01