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Dr Fabien Lacasa (Institut d'Astrophysique Spatiale, Orsay)20/11/2019 09:10
I will show how the non-Gaussianity induced by the non-linear growth of structure needs to be accounted for for the next-generation of galaxy surveys. I will present new non-Gaussian covariance terms and their numerical implementation for the galaxy angular power spectrum, showing that it is necessary to go beyond the previous state of the art already for a Euclid baseline cosmological...
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Dr Santiago Casas (CosmoStat, CEA Paris-Saclay)20/11/2019 09:30
The Effective Field Theory of Dark Energy (EFToDE) is a powerful formalism that classifies and unifies theories of modified gravity according to their imprints on the cosmological background and structure formation and links these properties to specific operators in the action. It also contains the famous Horndeski theory as a subset. Despite the fact that the original functional parameter...
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Nathalie Palanque-Delabrouille (CEA)20/11/2019 10:10
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Christophe Yeche (CEA Irfu/SPP)20/11/2019 10:30
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Mme Lavinia Heisenberg (ETH Zurich)20/11/2019 11:30
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Francis Bernardeau (IAP)20/11/2019 12:10
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Dr stephane plaszczynski (CNRS)20/11/2019 12:30
L'environement de travail Apache Spark est tres utilise dans
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l'industrie pour organiser et analyser les grands volumes de donnees.
Je montrerai que cette "technologie Big Data" peut egalement etre
appliqueee en science sans trop de souffrances, en particulier en
astrophysique ou les volumes de donnees des prochains grands releves
de galaxies augmentent drastiquement.
A partir d'une... -
Anais Moller (CNRS / LPC Clermont)20/11/2019 12:40
Next generation experiments will provide an unprecedented volume of data to constrain the nature of Dark Energy. LSST is expected to detect 10,000 transient candidates every 30 seconds, within these alerts LSST will discover supernovae that can be used in cosmology analyses. To fully harness the power of LSST, it is imperative to develop innovative methods able to deal with large data volumes...
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Francoise Combes (Observatoire de Paris)20/11/2019 14:20
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Louise Breuval (Observatoire de Paris, LESIA)20/11/2019 15:00
Cepheids represent a fundamental tool for measuring the distances in the Universe thanks to the Leavitt law (period-luminosity) relation. In order to calibrate this relation accurately, precise distance measurements are required. The Gaia satellite monitors a large number of Galactic Cepheids, and will eventually provide extremely accurate parallaxes to hundreds of them. This will considerably...
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Dr Gabriel Chardin (CNRS)20/11/2019 15:20
\documentclass[a4paper,oneside,12pt]{article}
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\usepackage{geometry}
\geometry{top=25mm,bottom=25mm,left=25mm,right=25mm,nohead,nofoot,includeheadfoot}
\usepackage{graphicx}
\pagestyle{empty}
\begin{document}
{\Large \bf Concordance and challenges of the Dirac-Milne cosmology\par}
\vspace{0.5cm}
{\large \bf G. Chardin$^1$, G. Manfredi$^2$\par}
\vspace{0.2cm}
{\footnotesize\itshape
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Eric Jullo (LAM)20/11/2019 15:40
In this talk, I will present a new high-resolution N-body simulation called Uchuu. It consists in a cosmological box size 2Gpc/h, and 12400^3 particles. The mass resolution is 2x10^8 Msun/h, and it has been produced with the latest Planck cosmological parameters. Rockstar halos catalogues, merger trees, lensing ligthcones up to z=7 and semi-analytical galaxies are being produced. The first...
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Nicolas Martinet (LAM/CNES)20/11/2019 16:40
Le Kilo Degree Survey (KiDS) est l'un des trois grands relevés contemporains de cisaillement cosmique, avec DES et HSC. Je présenterai les premiers résultats cosmologiques de KiDS publiés en 2016/2017, puis l'évolution de notre compréhension de la tension observée entre ces contraintes cosmologiques et celles obtenues à partir du satellite Planck. Cela nous amènera à considérer différentes...
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Nicolas Regnault (LPNHE)20/11/2019 17:00
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Mickael Rigault (LPC)20/11/2019 17:20
I will going to provide a summary of the first 1.5 years of ZTF and present the exiting science case of ZTF Phase 2
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Sébastien Derriere (CDS)21/11/2019 09:00
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Virginia Ajani (CEA Saclay)21/11/2019 09:40
Massive neutrinos deeply affect the background evolution of the Universe as well as the evolution of cosmological perturbations and structures formation. Modified gravity models that include massive neutrinos can present a degeneracy with $\Lambda$CDM model. Hence, being able to constrain the value of the sum of neutrino masses constitutes one among the key science goals of nowadays cosmology....
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Matthieu Tristram (LAL)21/11/2019 10:00
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Emmanuel Bertin (IAP)21/11/2019 11:10
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Jacques Delabrouille (APC)21/11/2019 11:30
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Prof. Norma G. SANCHEZ (CNRS LERMA OP PSL SU Paris)21/11/2019 11:50
The physical history of the Universe is completed by including the quantum planckian and super-planckian phase before Inflation in the Standard Model of the Universe in agreement with observations. In the absence of a complete quantum theory of gravity, we start from quantum physics and its foundational milestone: the universal classical-quantum (or wave-particle) duality, which we extend to...
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olivier perdereau (Laboratoire de l'Accelerateur Lineaire)21/11/2019 12:10
La cartographie d'intensite du rayonnement a 21cm de l'hydrogene neutre, a bas redshidt (z~1-3), pourrait permettre de reconstruire la distribution de la matiere a grande echelle et d'en extraire les proprietes statistiques. Idealement, on pourrait obtenir une tomographie de cette distribution sur un large intervalle de redshift et une large fraction du ciel. On presentera les defis,...
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Vivian Poulin (LAPTh)21/11/2019 14:00
The value of the Hubble constant as measured using the classical distance ladder method is 4 to 6sigma higher than the value inferred from a ΛCDM fit to the cosmic microwave background (CMB). While the possibility that unaccounted for systematic effect are responsible for this discrepancy, none are currently universally accepted. Moreover, we now have several independent local probes of the...
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Dr Romain Graziani (LPC)21/11/2019 14:40
The large scale structures (LSS) of our Universe result from the competition between expansion and gravitational interaction of matter. Hence, measuring the growth of LSS, through their peculiar velocities, is a key to probe both the expansion and gravity and precisely determine the nature of dark energy and validate General Relativity.
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Peculiar velocity measurements rely on precise... -
Anand Raichoor (EPFL)21/11/2019 15:00
SDSS/eBOSS and 4MOST/Cosmology surveys
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M. Tristan Blaineau (LAL)21/11/2019 15:20
Les microlentilles gravitationnelles permettent de contraindre l'abondance d'object compacts massifs. Les expériences passées (MACHO, EROS, MOA, OGLE) ont permis d'écarter des objets de masse inférieure à environ 10 masses solaires comme composante dominante de la matière noire. Cependant les détections récentes par LIGO/Virgo d'ondes gravitationnelles issues de coalescences de trous noirs de...
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Emmanuel Gangler (LPC)21/11/2019 16:20
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ziad sakr (IRAP : Institut de Recherche en Astrophysique et Planétologie)21/11/2019 16:40
Despite the remarkable success of LCDM model to fit almost all of the cosmological observations, a non negligible difference of the amplitude of matter fluctuation $\sigma_8$ still persists between local and deep universe probes. We review the status of this potential discrepancy with outcomes from the latest probes, then we show, in particular, the results from our investigation on trying to...
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21/11/2019 17:00
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Nicolas Martinet (LAM/CNES)
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M. Romain Teyssier (université de Zurich)
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philippe brax (IPHT Saclay)
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Mickael Rigault (LPC)
I will going to provide a summary of the first 1.5 years of ZTF and present the exiting science case of ZTF Phase 2
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