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The DESI collaboration (Dark Energy Spectroscopic Instrument) confirmed its groundbreaking results on dynamical dark energy through the largest 3-dimensional Universe map it observed. This talk highlights how DESI’s Baryon Acoustic Oscillation (BAO) measurements from Data Release 2 further challenge the ΛCDM paradigm, the standard cosmology for the past 30 years. The second part of this talk focuses on the robustness of these cosmological measurements. This includes improved models of the galaxy-dark-matter-halo connection for validating cosmological pipelines and detailed studies of spectroscopic systematics in redshift surveys. These efforts are essential for ensuring precise BAO measurements and reliable constraints on dark energy and neutrino mass.

BIO

Jiaxi Yu is a fellowship postdoc at Kavli IPMU in Japan. Her research interests are observational cosmology, large-scale structure and redshift surveys. Jiaxi obtained her PhD in astrophysics from EPFL in Switzerland under the supervision of Professor Jean-Paul Kneib. She is active in several major international collaborations, including the Dark Energy Spectroscopic Instrument (DESI), the Prime Focus Spectrograph (PFS), and the MUltiplexed Survey Telescope (MUST), with memberships that are portable to institutions outside the collaborations. Her research on the galaxy-dark-matter-halo relation bridges astrophysical modelling and precision cosmology, while her structured work of spectroscopic systematics in emission-line galaxies further enhances the robustness of DESI cosmological results.