Investigating cosmological weak lensing with the ray-bundle method |
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| Authors: | C JFluke R LWebster D JMortlock |
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| Institution: | 1Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia; 2School of Physics, The University of Melbourne, Parkville, Victoria 3052, Australia; 3Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE; 4Institute of Astronomy, Madingley Road, Cambridge CB3 0HA |
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| Abstract: | Using the ray-bundle method for calculating gravitational lens magnifications, we outline a method by which the magnification probability may be determined specifically in the weak lensing limit for cosmological models obtained from N -body simulations.
16 different models are investigated, which are variations on three broad classes of cold dark matter model: the standard model with (Ω0, λ 0)=(1.0,0.0) , the open model with (Ω0, λ 0)=(0.3,0.0) and the lambda model, which is a flat model with a cosmological constant (Ω0, λ 0)=(0.3,0.7) .
The effects of varying the Hubble parameter, H 0, the power spectrum shape parameter, Γ, and the cluster mass normalization, σ 8, are studied. It is shown that there is no signature of these parameters in the weak lensing magnification distributions. The magnification probability distributions are also shown to be independent of the numerical parameters such as the lens mass and simulation box size in the N -body simulations. |
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| Keywords: | gravitational lensing methods: numerical cosmology: miscellaneous large-scale structure of Universe |
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