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期刊论文
Detection of dark matter Skewness in the VIRMOS-DESCART survey: Implications for Ω0
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Weak gravitational lensing provides a direct statistical measure of the dark matter distribution. The variance is easiest to measure, which constrains the degenerate product 8 0.6 0. The degeneracy is broken by measuring the skewness arising from the fact that densities must remain positive, which is not possible when the initially symmetric perturbations become non-linear. Skewness measures the non-linear mass scale, which in combination with the variance measures 0 directly. We present the first detection of dark matter skewness from the Virmos-Decart survey. We have measured the full three point function, and its projections onto windowed skewness. We separate the lensing mode and the B mode. The lensing skewness is detected for a compensated Gaussian on scales of 5.37 arc minutes to be k-3=1.06±0.06×10−6. The B-modes are consistent with zero at this scale. The variance for the same window function is k-2=5.32±0.62±0.98×10−5, resulting in S3=375+342−124. Comparing to N-body simulations, we find 0<0.5 at 90% confidence. The Canada-France-Hawaii-Telescope legacy survey and newer simulations should be able to improve significantly on the constraint.
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