Search Results for author: Massimo Viola

Found 4 papers, 4 papers with code

KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering

1 code implementation20 Jul 2017 Shahab Joudaki, Chris Blake, Andrew Johnson, Alexandra Amon, Marika Asgari, Ami Choi, Thomas Erben, Karl Glazebrook, Joachim Harnois-Deraps, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Dominik Klaes, Konrad Kuijken, Chris Lidman, Alexander Mead, Lance Miller, David Parkinson, Gregory B. Poole, Peter Schneider, Massimo Viola, Christian Wolf

The complementarity of our observables allows for constraints on modified gravity degrees of freedom that are not simultaneously bounded with either probe alone, and up to a factor of three improvement in the $S_8$ constraint in the extended cosmology compared to KiDS alone.

Cosmology and Nongalactic Astrophysics

CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics

1 code implementation21 Jan 2016 Shahab Joudaki, Chris Blake, Catherine Heymans, Ami Choi, Joachim Harnois-Deraps, Hendrik Hildebrandt, Benjamin Joachimi, Andrew Johnson, Alexander Mead, David Parkinson, Massimo Viola, Ludovic van Waerbeke

When the systematic uncertainties are considered independently, the intrinsic alignment amplitude is the only degree of freedom that is substantially preferred by the data.

Cosmology and Nongalactic Astrophysics

The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses

1 code implementation6 Feb 2015 Henk Hoekstra, Ricardo Herbonnet, Adam Muzzin, Arif Babul, Andisheh Mahdavi, Massimo Viola, Marcello Cacciato

Nonetheless we find that the uncertainty in the determination of photometric redshifts is the largest source of systematic error for our mass estimates.

Cosmology and Nongalactic Astrophysics

Weak gravitational lensing with DEIMOS

1 code implementation5 Aug 2010 Peter Melchior, Massimo Viola, Björn Malte Schäfer, Matthias Bartelmann

We introduce a novel method for weak-lensing measurements, which is based on a mathematically exact deconvolution of the moments of the apparent brightness distribution of galaxies from the telescope's PSF.

Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics

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