[Séminaire CosmoObs] Studying Inflation with the Dark Energy Spectroscopic Instrument
by
grand Amphi
LPSC
Cosmic inflation is considered the main paradigm for describing the early Universe and the origin of initial density perturbations. Primordial non-Gaussianities (PNGs) are one of the few probes of inflation, and to overcome the cosmic variance limit of CMB observations (which currently provide the best constraints on inflationary PNGs), one promising approach is to use the small imprint left by local PNGs on the large-scale spatial distribution of galaxies. In this talk, I will present the current status of local PNG measurements from the 3D clustering of quasars and luminous red galaxies in the Dark Energy Spectroscopic Instrument (DESI). I will also present the future prospects for PNG measurements with DESI-II, the next phase of DESI starting in 2029. This phase aims to explore the Universe at higher redshift than DESI with dense samples of new tracers (such as Lyman Break Galaxies), probing larger volumes thus with improved sensitivity to local PNG.
David Maurin