Séminaires
High redshift BAO from BOSS to DESI
par
→
Europe/Paris
Amphitéâtre (CPPM)
Amphitéâtre
CPPM
Description
The first detection of Baryon Acoustic Oscillations (BAO) in the correlation function of the galaxy density field by Eisenstein et al. (2005) and Cole et al. (2005) set a milestone in the era of precision cosmology, providing a new, independent method for the measurement of cosmological distances. The Baryon Oscillation Spectroscopic Survey (BOSS), one of the experiment of the third generation of the Sloan Digital Sky Survey (SDSS-III), produced the first high redshift (z=2.34) measurement of the BAO scale using the Lyman-alpha forest of quasars as a tracer of the underlying matter density field (Busca et al. 2013, Delubac et al. 2015). During this talk, I will review the analysis that led to this measurement as well as present its cosmological implications when combined with other results (Aubourg et al. 2015) including constraints on the Dark Energy. I will pursue by introducing the new extended Baryon Oscillation Spectroscopic Survey (eBOSS) and forthcoming Dark Energy Spectroscopic Instrument (DESI), and show how they will tighten the constraints on our cosmological model.