Cosmological constraints from the CFHTLenS shear measurements using a new, accurate and flexible way of predicting nonlinear mass clustering

Abstract

We explore the cosmological constraints from cosmic shear using a new way of modelling the non-linear matter correlation functions. The new formalism extends the method of Angulo & White (2010), which manipulates outputs of $N$-body simulations to represent the three-dimensional nonlinear mass distribution in different cosmological scenarios. We show that predictions from our approach for shear two-point correlations at $1$ to $300$ arcmin separations are accurate at the $\sim 10$\% level, even for extreme changes in cosmology. For moderate changes, with target cosmologies similar to that preferred by analyses of recent Planck data, the accuracy is close to $\sim 5$\%. We combine this approach with a MonteCarlo Markov Chain sampler to explore constraints on a $\Lambda$CDM model from the shear correlation functions measured in the Canada-France Hawaii Telescope Lensing Survey (CFHTLenS). We obtain constraints on the parameter combination ${\sigma }_8({\Omega }_m/0.27{)}^{0.6}=0.801\pm 0.028$. Combined with results from CMB data, we obtain marginalised constraints on ${\sigma }_8=0.81\pm 0.01$ and ${\Omega }_m=0.29\pm 0.01$. These results are fully compatible with previous analyses, which supports the validity of our approach. We discuss the advantages of our method and the potential it offers, including a path to incorporate in detail the effects of baryons, among others effects, in future high-precision cosmological analyses.

12 pages, 8 figures

References in corpus (3)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• CFHTLenS: Cosmological constraints from a combination of cosmic shear two-point and three-point correlations
• Cosmic Calibration: Constraints from the Matter Power Spectrum and the Cosmic Microwave Background

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