Arnaud de Mattia, Hector Gil-Marín and Pauline Zarrouk tell us about the latest DESI key papers. These ones are covering the “full shape” of the galaxy power spectrum. This is in contrast to their results from April, which were centred around the Baryon Acoustic Oscillation (BAO) feature.

The analysis is an absolute tour de force, explaining why the video is so long. DESI have done a lot of analysis and it takes a while to unpack. (The raw recording of this video was more than 200 minutes long!)

The results aren’t quite so eye-opening as the BAO ones were in April. The evidence for evolving dark energy is still there, but the significance of this evidence hasn’t changed much. They are however able to do a bunch of tests of modified gravity and find that, unlike ΛCDM, General Relativity appears to be in great shape (at least as far as DESI observations are concerned).

We’re properly in the era of Stage 4 cosmology now! Thanks DESI for the wonderful analyses and results.

Relevant papers on the arXiv:
2411.12026 – Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024
2411.12025 – Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis
2411.12024 – Mitigating Imaging Systematics for DESI 2024 Emission Line Galaxies and Beyond
2411.12023 – Exploring HOD-dependent systematics for the DESI 2024 Full-Shape galaxy clustering analysis
2411.12022 – DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
2411.12021 – DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
2411.12020 – DESI 2024 II: Sample Definitions, Characteristics, and Two-point Clustering Statistics

Arnaud: inspirehep.net/authors/1881382
Hector: www.ub.edu/bispectrum
Pauline: inspirehep.net/authors/1884383

DESI itself: desi.lbl.gov