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DeepSphere: Efficient spherical convolutional neural network with HEALPix sampling for cosmological applications
Related publications (36)
Assessing tension metrics with dark energy survey and Planck data
Eduardo Sanchez, Jonathan Andrew Blazek
Quantifying tensions - inconsistencies amongst measurements of cosmological parameters by different experiments - has emerged as a crucial part of modern cosmological data analysis. Statistically significant tensions between two experiments or cosmological ...
2021H0LiCOW-XIII. A 2.4 per cent measurement of H-0 from lensed quasars: 5.3 sigma tension between early- and late-Universe probes
Frédéric Courbin, Georges Meylan, Martin Raoul Robert Millon, Hung-Hsu Chan, Vivien François Bonvin, Olga Tihhonova, Adriano Agnello
We present a measurement of the Hubble constant (H-0) and other cosmological parameters from a joint analysis of six gravitationally lensed quasars with measured time delays. All lenses except the first are analysed blindly with respect to the cosmological ...
OXFORD UNIV PRESS2020Euclid preparation: VII. Forecast validation for Euclid cosmological probes
Georges Meylan, Jean-Luc Starck, Maurizio Martinelli, Slobodan Ilic, Yi Wang, Richard Massey
Aims. The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct the expansion history of the Universe and the growth of cosmic structures. The estimation of the expected performance of the experiment, in terms of predicted ...
EDP SCIENCES S A2020Characterising the environment and the line of sight of gravitationally lensed quasars using weak lensing technique
Estimates of the Hubble constant from different cosmological probes produce discrepant results in the framework of the standard cosmological model. In order to assess whether this tension is coming from unaccounted systematic errors, or is hinting towards ...
EPFL2019Machine-learning methods for weak lensing analysis of the ESA Euclid sky survey
A clear picture has emerged from the last three decades of research: our Universe is expanding at an accelerated rate. The cause of this expansion remains elusive, but in essence acts as a repulsive force. This so-called dark energy represents about 69% of ...
EPFL2018DES Y1 Results: validating cosmological parameter estimation using simulated Dark Energy Surveys
Eduardo Sanchez, Mingkui Wang, Jonathan Andrew Blazek
We use mock galaxy survey simulations designed to resemble the Dark Energy Survey Year 1 (DES Y1) data to validate and inform cosmological parameter estimation. When similar analysis tools are applied to both simulations and real survey data, they provide ...
OXFORD UNIV PRESS2018Precise measurements of time delays in gravitationally lensed quasars for competitive and independent determination of the Hubble constant
During these last decades, by virtue of observations, the Standard Cosmological Model has emerged, providing a description of the Universe's evolution using a minimal set of independent constraints - the cosmological parameters. Among them is the expansion ...
EPFL2017H0LiCOW-I. H-0 Lenses in COSMOGRAIL's Wellspring: program overview
Frédéric Courbin, Georges Meylan, Malte Tewes, Vivien François Bonvin, Olga Tihhonova, Adriano Agnello
Strong gravitational lens systems with time delays between the multiple images allow measurements of time-delay distances, which are primarily sensitive to the Hubble constant that is key to probing dark energy, neutrino physics and the spatial curvature o ...
Oxford Univ Press2017H0LiCOW-V. New COSMOGRAIL time delays of HE 0435-1223: H-0 to 3.8 per cent precision from strong lensing in a flat Lambda CDM model
Frédéric Courbin, Georges Meylan, Malte Tewes, Vivien François Bonvin
We present a new measurement of the Hubble Constant H-0 and other cosmological parameters based on the joint analysis of three multiply imaged quasar systems with measured gravitational time delays. First, we measure the time delay of HE 0435-1223 from 13- ...
Oxford Univ Press2017Cosmological implications of baryon acoustic oscillation measurements
Jean-Paul Richard Kneib, Johan Comparat, David Schlegel, Timothée Guy Olivier Delubac
We derive constraints on cosmological parameters and tests of dark energy models from the combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. In p ...
Amer Physical Soc2015