Julien Guy (LPNHE) " The Prospects and Challenges of the Dark Energy Spectroscopic Instrument

Abstract :
I will present the prospects of DESI for the measurement of Dark
Energy in light of a decade of efforts to unveil its nature, from the
discovery of cosmic acceleration with type Ia supernovae, to the most
recent results with supernovae and baryon acoustic oscillations (BAO).
DESI will map cosmic expansion up to redshifts of 3, anchoring
distances at low redshift to the era of past deceleration with an
order of magnitude gain in precision compared to current surveys.
DESI data will offer a stringent test of the standard model of
cosmology, with important possibilities for discovery.
The project, however, is not free from experimental challenges. I will
review the analysis efforts needed to extract the whole potential of
the BAO probe, from the optimization and calibration of the efficiency
of the redshift survey, to the characterization of the instrumental
noise in the Lyman-alpha forests.