In this talk, I will present the work we did in Cuesta-Lazaro et al. (2020, arXiv:2002.02683). I will first remind the ingredients we need to get a prediction of the redshift-space clustering of galaxies and extract constraints on the growth rate of structures. Then, I will present the improvement of the modelling of the galaxy pairwise velocities at small scales we proposed using the Skew-T...
Nouveaux résultats seront présentés pour l’énergie noire dans l’Univers depuis ses phases quantiques planckienne et trans-planckienne avant l’inflation jusqu’à la phase actuelle en accord avec les observations. Les niveaux quantiques discrets de l’énergie du vide cosmologique seront présen-tés permettant de caracteriser et suivre les différentes phases jusqu’au continuum classique des...
Generalized Dark Matter in one of its simplest form is an extension to the dark matter paradigm allowing homogeneous and perturbed pressures through a non vanishing equation of state parameter with a sound speed parameter different from zero. Yet these deviations from LCDM model could translate in large changes in the determination of geometrical cosmological observables as well as those of...
We compare the maximal abundance of massive systems predicted in different dynamical dark energy (DDE) models at high redshifts $z \approx 4-7$ with the measured abundance of the most massive galaxies observed to be already in place at such redshifts. The aim is to derive constraints for the evolution of the
dark energy equation of state parameter $w$ which are complementary to existing...
In this talk, I will present a work I did (publication under collaboration review) where I measured the Baryon Acoustic Oscillations in the projected cross-correlation function binned into transverse comoving radius between the SDSS-IV DR16 eBOSS quasars and a dense photometric sample of emission line galaxies selected from the DESI Legacy Imaging Surveys, which enables to constrain the...
Abstract :
Nous avons mené une étude sommaire afin d'avoir une approximation des résultats qui pourraient être obtenus dans le cas de corrélations croisées entre les sondes Galaxy Clustering spectroscopiques (GCsp) et les sondes photométriques (Galaxy Clustering photométrique - GCph - et Lentillage faible - Weak Lensing - WL). L'approche consiste à assimiler les bins spectroscopiques et une...
