Title: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations using Lyman alpha forests from DESI and CSST

Speaker: Ting Tan

Abstract: 

The Baryon Acoustic Oscillations (BAO) is a powerful large-scale structure probe that is used to constrain dark energy models, and is the main goal of the latest large cosmology survey, eBOSS and Dark Energy Spectroscopic Instrument (DESI). I will present DESI second Data Release (DR2) cosmological results with a particular focus on the measurement of BAO from Lyman-α forest. We measure the isotropic BAO scale with precision of 0.65% at zeff = 2.33. Together with other DESI BAO measurements using galaxies or quasars at lower redshifts, these results are used to constrain cosmological parameters. I will also present forecasts of the measurement of BAO using Lyman-α forest from the Chinese Space Station Telescope (CSST).

Bio: 谭铤，法国原子能署(CEA Saclay)/巴黎萨克雷大学博士后，暗能量光谱巡天DESI合作组成员，索邦大学&加州大学伯克利分校联培博士（2023），苏黎世联邦理工&巴黎综合理工联培硕士（2020），里昂第一大学&武汉大学联培学士（2018）。研究方向为重子声学震荡，弱引力透镜，莱曼森林。

Time: 14:00-15:00, 22/July, Tuesday 

Venue: Room 506 (Large seminar room), Department of Astronomy