The European Low Frequency Survey: observing the radio sky to understand the beginning of the Universe

Nowadays the leading contender to understand the initial conditions of the Big Bang is inflation, which predicts the existence of a primordial background of gravitational waves that must have left its imprint in the CMB polarization: the so-called ​ B-modes. The main difficulty in measuring the ​ B-modes comes not just from its sheer faintness but from the fact that many other objects in the universe also emit polarized microwaves.

The power of probe combination : cosmology with LSS and CMB data

Through weak lensing and galaxy clustering measurements, the next generation of large-scale surveys (Euclid, LSST, ...) will provide unprecedented observations and constraints on the late Universe, and thus shed light on dark matter and dark energy. On the other hand, high-quality CMB observations (current and planned) can -- and already do -- put tight constraints on the early Universe and its content.

PPCM meeting #4 at APC

Dear cosmologists of the Parisian area and beyond,

This is a reminder that our next PPCM meeting will be held next week, on the 3rd of March at APC.

A program is available on PPCM's website and on the Indico webpage of the event where you are kindly asked to register. It is also summarised at the end of this email.

Best regards,

Yashar Akrami (ENS), Julien Grain (IAS), Sébastien Renaux-Petel (IAP),  Vincent Vennin (APC), Filippo Vernizzi (IPhT - CEA).

Cosmology with peculiar velocities

The Universe is not homogenous. Since the early times, its structures have grown and moved under the laws of gravity. By measuring these motions today we are able to trace the spatial distribution of dark matter and accurately map the Universe. The comparison of the recovered large scale structures with the predictions of the concordance model of cosmology is then a powerful test of the laws of expansion and gravity. 

DESI, unraveling dark energy

I will present the stage-IV Dark Energy Spectroscopic Instrument (DESI). The scientific goals of DESI on dark energy, redshift space distortions and constraints on inflation or neutrino mass will be compared to current measurements and limits set by ongoing experiments, in particular by the SDSS BOSS and eBOSS projects. I will illustrate the construction status of DESI, which is nearing completion, and give the timeline of the five-year survey. The project has successfully observed its first spectroscopic light and is now under commissioning.

Euclid Clusters - a joint meeting of the Cluster SWG & OU-LE3


Euclid will greatly advance galaxy cluster science, in both cosmology and astrophysics, by providing a large catalog of clusters extending to redshifts well beyond unity and with high quality gravitational lensing measurements. This is a joint meeting of the Galaxy Cluster Science Working Group (SWG) and OU-LE3 group of the science ground segment. The meeting will cover critical areas of on-going work in the preparation of mission data analysis.

Cosmologie WG, GdR Ondes gravitationnelles

La prochaine réunion du groupe de travail Cosmologie des ondes gravitationnelles GdR se tiendra le 13 novembre prochain à APC, 10 rue Alice Domon et Léonie Duquet, dans le 13ème arrondissement de Paris.

S'il vous plaît, marquez dans votre agenda et inscrivez-vous sur la page web indico ! Veuillez noter que même si vous n'êtes pas inscrit en tant que membre du GdR, vous êtes les bienvenus (et vous pouvez vous inscrire au GdR si vous le souhaitez !). Vous êtes également encouragé à transmettre ce courriel à toute personne susceptible d'être intéressée.


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