The Future of Dark Energy from Massive Redshift Surveys: DESI, DESI-II and Spec-S5

by David Schlegel (LBNL)

Tuesday 18 Nov 2025, 03:30 → 05:30 US/Eastern

LSR

The Dark Energy Sepctroscopic Instrument (DESI) is mapping 60 million
galaxies and quasars to precisely measure the expansion history of the
universe.  Results from the first three years of DESI indicate a
time-evolution of dark energy.  A next-generation of massive redshift
surveys promise to more thoroughly explore dark energy, the physics of
early universe inflation, and the effects of dark matter in the Milky
Way.  DESI-II and Spec-S5 will target high-redshift galaxies selected
from Rubin Observatory imaging to build the necessary three dimensional
maps at redshifts z>2.  The more ambitious scope of Spec-S5 relies upon
significant upgrades to telescopes, fiber robots, spectrographs and
detectors.

 

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