An Overview of DESI and the first detection of the BAO signal using its early data

by Christoph Saulder (KASI)

Wednesday 26 Apr 2023, 15:00 → 16:00 Asia/Seoul

Seminar Room (CTPU)

"The Dark Energy Spectroscopy Instrument (DESI) is a highly efficient multiobject fibre spectrograph that has been designed to measure the expansion rate of the universe over a wide redshift range using the baryon acoustic oscillations (BAO). I will present an overview on its main science goals and performance this ground-based Stage-IV dark energy survey. Furthermore, I will show the first detection of BAO signal at already up to 5-sigma level only using the first two months of DESI observation. Using this early data as well as simulations, we forecast DESI to achieve a high-significance BAO detection at sub-percent precision with the completed 5-year survey data. This exquisite level of precision will set new standards in cosmology and confirm DESI as the most competitive BAO experiment for the remainder of this decade.