Latest Results from the Dark Energy Spectroscopic Instrument

The Dark Energy Spectroscopic Instrument (DESI) is conducting a five-year program to measure the effect of dark energy on the expansion of the Universe and the growth of structure within it. It is the first of the new generation of so-called stage IV cosmological surveys, and will obtain optical spectra for tens of millions of galaxies and quasars. I will present the latest cosmological results derived from the DESI measurements of baryon acoustic oscillations, including constraints on the expansion rate of the Universe, the dark energy equation of state, and upper bounds on the sum of neutrino masses. I will contrast these results with those obtained from previous datasets and show results in combination with cosmic microwave experiments and supernova surveys. These data provide a strong test of whether dark energy matches the predictions of Einstein's cosmological constant, Lambda. I will discuss the tests of this made possible by the latest data and present new results testing the standard model of cosmology, and setting the path forward to future DESI data analyses.