Cosmology and Statistics Laboratory

Jun 17, 2022

Weak gravitational lensing reveals dark-matter maps of the cosmic web

Scientists from the CosmoStat laboratory at CEA have produced within the international science collaboration UNIONS (Ultraviolet Near Infrared Optical Northern Survey) a reference catalogue of 100 million gravitationally lensed distant galaxies, one of the largest datasets ever created. This new collection is based on thousands of deep images of the northern sky captured by MegaCam, a large digital camera built at CEA, mounted on the Canada-France-Hawaii Telescope (CFHT).

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Jun 01, 2021

Valeria Pettorino receives the MCAA award for career excellence

Valeria Pettorino was awarded with the 2020 MCAA (Marie Curie Alumni Award) for her outstanding career (CEA/IRFU, Saclay) for her work in the Euclid collaboration and her involvement in the scientific community through various activities such as mentoring, event organisation, communication and more recently science diplomacy. This award is presented by the MCAA association, which is an international network of all researchers who have received a Marie Curie Fellowship.

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Valeria Pettorino receives the MCAA award for career excellence

Dec 11, 2020

Facebook Challenge in AI: CEA researchers ranked 2nd

In the field of artificial intelligence, international competition is tough. So when researchers from CEA-Joliot and CEA-IRFU challenge start-ups and other companies specializing in AI, we cheer them on. Here’s a success story from the field of MRI reconstruction.

Feb 13, 2020

Optimizing Euclid: cross-correlation between observables

To measure cosmological parameters, the Euclid space telescope will use two main probes: gravitational lensing (Weak Gravitational Lensing) and galaxy distribution (Galaxy Clustering). These measurements will allow us to study dark energy and dark matter, which affect the growth of cosmic structures and the accelerated expansion of the Universe.

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Optimizing Euclid: cross-correlation between observables

Nov 20, 2019

Free Fall

Microscope satellite consolidates the Einstein Equivalence Principle

Testing the equivalence principle, a fundamental principle of the general relativity developed by Albert Einstein from which the universality of free fall derives, that is the challenge undertaken by the Microscope spacecraft.

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May 22, 2018

Image analysis to better reveal dark matter

New statistical methods reveal the finest details of the Universe

A team led by University College London (UCL), in collaboration with the Astrophysics Department of CEA-Irfu, has significantly improved the analysis of dark matter maps in the Universe with new methods of data analysis. The maps produced by this analysis demonstrate the power of these new innovative methods for analyzing future large data sets such as those expected from the upcoming EUCLID cosmological mission. These results are published in the MNRAS journal.

Image analysis to better reveal dark matter

Jan 27, 2014

The most detailed map of the first light of the Universe

A new method for the reconstruction of the finest details

Using the latest data from the Planck and WMAP satellites, the laboratory CosmoStat (LCS) of CEA-IRFU just provides the most complete and accurate picture of the diffuse microwave background of the universe considered to be the primary light emitted at the beginning of the expansion. The new map of the diffuse background was built thanks to a new method of separating components called LGMCA particularly well suited to the separation of galactic foregrounds that blur the background image.

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Division of Electronics, Detectors and Computing for Physics (DEDIP)

Institute of Research into the Fundamental Laws of the Universe