3:30–4:30 pm ERC 161
Host: Chihway Chang
Paul Martini (Ohio State University) "Cosmology with Large Spectroscopic Surveys"
Large scale spectroscopic surveys provide unique information that addresses many fundamental questions in physics, especially the nature of cosmic acceleration or dark energy, dark matter, and primordial inflation. The Dark Energy Spectroscopic Instrument (DESI) collaboration recently released new cosmological results based on over six million extragalactic objects with 0.1 < z < 4.2 observed during the first year of survey operations. The DESI collaboration has used this dataset to measure Baryon Acoustic Oscillations in seven redshift bins to determine the transverse comoving distance and Hubble expansion rate, as well as combined these results with other datasets to explore extensions to the standard flat LCDM cosmological model and obtain constraints on the sum of neutrino masses. I will describe the design and implementation of the DESI survey and summarize our recent results, with a particular focus on the Lyman Alpha forest measurement at z > 2.1. The DESI survey is scheduled to continue for a total of five years, and several extensions are in active development. I will broadly describe the motivations for these surveys and the technology development planned for both continued operation of the DESI instrument and for the next generation of spectroscopic surveys.
