Speaker
Description
The Dark Energy Spectroscopic Instrument (DESI) collaboration is conducting a five-year redshift survey of over 40 million galaxies. By targeting four different galaxy tracers, bright galaxies, luminous red galaxies, emission line galaxies and quasars across a large redshift range 0.1<z<3.5, DESI is designed to measure the expansion history of the Universe using Baryon Acoustic Oscillations (BAO) and the growth of structure using Redshift Space Distortions (RSD). In this talk, I will provide an overview of the DESI instrument, its survey design and present the latest data release DR1/DR2. I will present the recently unblinded Year-2 BAO measurements from galaxy and quasar clustering over 0.1<z<2, which collectively surpass the precision of all pre-DESI BAO results. I will also highlight the systematics mitigation, covariance modeling, and survey validation efforts that underpin these high-precision results. These measurements represent a major milestone toward DESI’s goal of delivering sub-percent constraints on cosmic distances and structure growth and revealing a new trend for evolving dark energy.
