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Philippe Brax (IPHT Saclay)10/23/18, 10:30 AM
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Christophe Yeche (CEA Irfu/SPP)10/23/18, 11:10 AM
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Frederic Henry-Couannier10/23/18, 11:50 AM
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Xavier Sarazin (LAL), François COUCHOT (CNRS/IN2P3/LAL)10/23/18, 12:10 PM
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Valeria Pettorino (CEA Paris-Saclay, Departement of Astrophysics, CosmoStat Lab)10/23/18, 2:00 PM
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Alejandro Perez (LPNHE), Dr Daniel Sudarsky (UNAM), Prof. James D. Bjorken (SLAC )10/23/18, 2:40 PM
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Maxim Khlopov (APC and MEPHI)10/23/18, 3:00 PM
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Dominique Boutigny (LAPP)10/23/18, 3:20 PM
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Stéphane Ilic (Institut de Recherche en Astrophysique et Planétologie)10/23/18, 4:30 PM
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Fabien Lacasa (Université de Genève)10/23/18, 4:50 PM
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Dr Emille Ishida (LPC-UCA)10/23/18, 5:10 PM
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Eric Jullo (LAM)10/23/18, 5:50 PM
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Dr Emmanuel Bertin (IAP)10/24/18, 9:00 AM
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Marguerite PIERRE (CEA Saclay)10/24/18, 9:40 AM
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Cecile Renault (LPSC)10/24/18, 10:20 AM
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Prof. Nick Kaiser (ENS)10/24/18, 11:10 AM
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Aurelien Hees (SYRTE - Observatoire de Paris), Dr Michel Abgrall (SYRTE, Observatoire de Paris), Dr Sebastien Bize (SYRTE, Observatoire de Paris), Dr Pacome Delva (SYRTE, Observatoire de Paris), Dr Jocelyne Guéna (SYRTE, Observatoire de Paris), Dr Olivier Minazzoli (Artemis, OCA and CSM), Dr Benjamin Roberts (SYRTE, Observatoire de Paris), Dr Etienne Savalle (SYRTE, Observatoire de Paris), Yevgeny Stadnik (Johannes Gutenberg University of Mainz)10/24/18, 11:50 AM
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Ixandra Achitouv10/24/18, 12:10 PM
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Dr Edward Porter (APC Paris)10/24/18, 2:00 PM
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Adrien Kuntz (CPT Marseille)10/24/18, 2:40 PM
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Christian Marinoni (Centre de Physique Théorique, Marseille)10/24/18, 3:00 PM
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Filippo Vernizzi (IPhT - CEA Saclay)10/24/18, 3:20 PM
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Karim Noui (LMPT Tours)10/24/18, 4:00 PM
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Dr Yann Rasera (LUTH)10/24/18, 4:50 PM
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Pierros Ntelis (Astroparticule et Cosmology Group)10/24/18, 5:30 PM
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Sylvain de la Torre (LAM)10/24/18, 5:50 PM
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10/24/18, 7:40 PM
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Emmanuel Gangler (LPC)10/25/18, 9:00 AM
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Johanna Pasquet (CPPM)10/25/18, 9:40 AM
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Dr Agnes Ferte (Jet Propulsion Laboratory)10/25/18, 10:00 AM
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Mickael Rigault (LPC)10/25/18, 10:20 AM
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Agnes FIENGA (Institut UTINAM)10/25/18, 11:10 AM
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Pierre-François Léget (Stanford University)10/25/18, 12:00 PM
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Alain Blanchard (IRAP , OMP), Stéphane Ilic (Institut de Recherche en Astrophysique et Planétologie), ziad sakr (IRAP : Institut de Recherche en Astrophysique et Planétologie)10/25/18, 12:20 PM
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Dr Ziad Sakr (IRAP : Institut de Recherche en Astrophysique et Planétologie)10/25/18, 2:20 PM
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Romain Graziani (IPNL)10/25/18, 2:40 PM
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Guillaume Pignol (LPSC)10/25/18, 3:00 PM
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Mr Françis Bernardeau (IAP)10/25/18, 3:20 PM
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Alain Blanchard (IRAP , OMP)10/25/18, 4:00 PM
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Johanna Pasquet (CPPM)
Future large surveys like the Large Synoptic Survey Telescope (LSST) aim to increase the precision and accuracy of observational cosmology. In particular, LSST will observe a large quantity of well-sampled type Ia supernovae that will be one of the major probe of dark energy. However the spectroscopic follow-up for the identification of supernovae and the estimation of redshift will be...
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Prof. Alejandro Perez (Centre de Physique Theorique)
We argue that discreteness at the Planck scale (naturally expected to arise from quantum gravity) might manifest in the form of minute violations of energy-momentum conservation of the matter degrees of freedom when described in terms of (idealized) smooth fields on a smooth spacetime. In the context of applications to cosmology such `energy diffusion' from the low energy matter degrees of...
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Dr Aurelien Hees (SYRTE, Observatoire de Paris)
In several theoretical scenarios, a scalar field is introduced to model dark energy. While some properties of this scalar field can be constrained by cosmological observations, certain properties like its coupling with the standard model fields can be searched for with local experiments such as the ones testing for the universality of free fall and the ones using atomic clocks. Such...
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Stéphane Ilic (Institut de Recherche en Astrophysique et Planétologie)
Grâce aux mesures de lentillage gravitationnel et de clustering des galaxies, la prochaine génération de grands relevés (Euclid, LSST) posera des contraintes sans précédent sur l'Univers récent. D'autre part, des observations CMB de haute qualité (Planck et futures expérience) sont capables d'imposer des contraintes strictes sur l'Univers primordial. Je montrerai comment la combinaison et la...
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Stéphane Ilic (Institut de Recherche en Astrophysique et Planétologie)
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Pierros Ntelis (Astroparticule et Cosmology Group)
In the era of the upcoming stage IV surveys, the sky will be more revealing than ever. In this talk, I will put the homogeneity scale in the general cosmological context. I will show how one can use the homogeneity scale as a standard ruler to learn about the large scale structures.
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Xavier Sarazin (LAL)
As initially proposed by H.A. Wilson, then R.H. Dicke, the curved spacetime in a stationary gravitational field can be equivalently interpreted as being due to a spatial change of both the vacuum refractive index and the inertial masses in a Euclidean metric. Dicke further extended this framework to explain the cosmological redshift, assuming a flat and static Euclidean metric but a vacuum...
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Fabien Lacasa (Université de Genève)
One of the main challenges for cosmological analysis of future galaxy surveys is the non-linearity of the evolution of the large scale structure (LSS). Among the consequences of this non-linearity is the development of non-Gaussianity of the density field. And this non-Gaussianity yields new covariance terms for our observables, additional to the classical Gaussian variance that we have been...
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Christian Marinoni (Centre de Physique Théorique, Marseille)
High-precision astrometric experiments might constrain our proper acceleration through space via real-time observations of the change in the aberration of sources at cosmic distances.
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The cosmological component of this aberration drift signal, the non-inertial motion generated by the large-scale distribution of matter, can in principle be detected by
astrometric surveys. It can provide... -
Dr Mickael Rigault (LPC)
I will present the Hubble Constant controversy, that is, the different direct or indirect measurements of the Hubble Constant and how some are in significant tension. Then I'll present our current work on astrophysical bias in Type Ia Supernova distance measurements and explain how such effect could explain the aforementioned tension.
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Alain BLANCHARD (IRAP , OMP)
Le modèle LCDM est un succès remarquable de la cosmologie moderne, rendant compte des principales observations du champ cosmologique, ses six paramètres de base étant maintenant mesurés avec une précision de l'ordre du pourcent. L'abondance des amas détectés par effet SZ est toutefois très en deçà des prédictions du modèle normalisé aux fluctuations mesurées par Planck. L'origine de cette...
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Dr Agnes Ferte (Jet Propulsion Laboratory)
The Dark Energy Survey is one of the largest ongoing survey probing the late universe, specially through galaxy clustering and weak gravitational lensing. The data from the first year of DES observations were used to constrain the LambdaCDM model in 1708.01530, combining clustering and weak lensing measurements from the same experiment for the first time. We used this combination of data to...
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Dr Pierre-François Léget (Stanford University)
Type Ia Supernova (SNIa) distance measurement for cosmology is based on a well-established observational paradigm that two main effects explain their variabilities in luminosity: stretch (link to intrinsic properties), and color (link mainly to dust extinction). However, after correcting the luminosity of both stretch and color, an intrinsic scatter in luminosity and a correlation of Hubble...
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Adrien Kuntz (CPT Marseille)
Dans cette présentation, je parlerai de la théorie effective de Goldberger et Rothstein pour obtenir les équations régissant un système binaire. Je montrerai comment elle peut être adaptée à une théorie tenseur-scalaire en mettant en avant les points sur lesquelles ces théories diffèrent de la relativité générale.
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Mr Safir Yahia-Cherif (IRAP)
One of the main prediction of inflationary cosmology is the spatial flatness of the universe. The combination of observed CMB fluctuations with SNIa observations and BAO leads to a prediction of the spatial curvature parameter lower than 1e-4. Observations have shown the acceleration of the expansion of the universe revealing the existence of two dark component : the dark matter and the dark...
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Dr Ixandra Achitouv (Observatoire de Paris )
The growth rate of cosmic structures is a powerful quantity to probe gravitational interactions and dark energy. In the late-time Universe the growth rate becomes non-linear, making it more difficult to probe, but also makes it in principle a source of additional cosmological information than its linear counterpart. In this talk, I will discuss why it becomes interesting to probe the growth...
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Eric Jullo (LAM)
The combination of GGL and RSD allow to break the degeneracy between the growth rate parameter $f$ and the matter density $\Omega_m$. In this talk, I will present our results obtained with the BOSS/CMASS sample at redshift $z=0.57$, and the weak-lensing over an area of 338 deg$^2$. Using an ensemble of joint lensing and clustering lightcones, we also characterize the statistical properties of...
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frederic henry-couannier
Dark Gravity theories are extensions of General Relativity aiming at a stable anti-gravitational sector. The most natural extension of GR in presence of a flat non dynamical background turns out to be such a Dark Gravity theory and it is able to reproduce GR predictions extremely well in many sectors except that it avoids true Black Hole Horizon as well as Big-Bang singularity. The symmetries...
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Dr Ziad SAKR (IRAP - USJ)
In the frame of the dark energy colloquium, we investigate the impact of a dark energy different from fiducial $\Lambda$CDM, on a discrepancy on the amplitude of matter fluctuation $\sigma_8$ found between local and deep probes. In particular between local, X ray, or near universe, SZ detected cluster counts samples and deep CMB temperature and polarization angular correlation spectrums.
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We... -
Karim Noui (LMPT Tours)
Les théories tenseur-scalaire offrent un cadre formidable pour tester les éventuelles limites de la relativité générale. Elles sont des modifications de la théorie d'Einstein qui pourraient rendre compte de la présence d'énergie noire dans l'univers par exemple.
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Je vous propose de présenter tout d'abord la construction d'une très grande classe de théories tenseur-scalaire qui a fortement été... -
Prof. Maxim Khlopov (APC and MIFI)
Taking apart cosmological constant, being constant by definition, physics of dark energy may lead to its time dependence. In the simplest case time dependence of the homogeneously distributed comological energy can be implemented in the model with cosmological term and unstable dark matter, decaying after the first objects are formed and contributing the homogeneously distributed energy...
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