Cosmological results from the Dark Energy Spectroscopic Instrument

A quarter-century after the discovery of the accelerated expansion of the universe, the constraints on dark energy that powers this acceleration have become very good, but physical nature of dark energy remains elusive.  I will present and discuss cosmological results from the measurement of baryon acoustic oscillations (BAO) in the first year of observations from the Dark Energy Spectroscopic Instrument (DESI Y1). These results, when combined with other data, have indicated a possible new anomaly in the behavior of dark energy, and also provided unprecedented constraints on neutrino mass and primordial non-Gaussianity. Because DESI Year-3 BAO results are expected to be released a few weeks prior to this talk, I will be able to discuss the Y3 BAO results as well.