CFHTLenS: Constraining the Dark Universe with CFHTlenS Weak Lensing Survey

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CFHTLenS: Constraining the Dark Universe with weak lensing from the CFHT Lensing Survey

We have taken part in the largest galaxy survey to measure the distribution of dark matter in the Universe using the gravitational lensing effect. More than 4.2 million galaxies have been observed for over 500 nights at the Canada-France Hawaii Telescope (CFHT) with the camera MegaCam, built at the CEA. Measuring the weak-lensing distortions from these galaxies, we determined the fraction of dark matter and dark energy up to 8.8 billion years in the past. Together with other experiments the results showed that the Universe is undergoing a phase of accelerated expansion, due to a yet unknown “dark-energy” component, that makes up around 70% of the cosmos. Those measurements were also use to test the laws of gravity on large scales. Some models of deviations from Einstein’s theory of general relativity could be ruled out by the data, reducing possible alternatives for the cause of the accelerated expansion of the Universe.

Reference 1: Kilbinger et al, CFHTLenS: combined probe cosmological model comparison using 2D weak gravitational lensing, MNRAS, 3, 2200-2220, 2013

Reference 2: Simpson F, Heymans C, Parkinson D, Blake C, Kilbinger M & al. 2013 MNRAS 429, 2249–2263

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Author: Samuel Farrens

I have been a postdoctoral researcher at CEA Saclay since October 2015. I am currently working on the DEDALE project and the Euclid mission with Jean-Luc Starck.

My background is in optical detection of clusters of galaxies and photometric redshift estimation. I am now branching out into the field of PSF estimation using sparse signal processing techniques.

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