Séminaire Univers / |
| « LCDM Strikes Back: Cosmology from Year 3 of the Dark Energy Survey » |
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Jonathan Blazek |
| The Dark Energy Survey has just released its Year 3 cosmology results. Covering 5000 square degrees, this data set is the largest weak lensing catalog analyzed to date, and the analysis methodology is correspondingly more sophisticated. The headline result is that the LCDM model consistently describes the data, and tension with CMB constraints from Planck is somewhat reduced compared to past results. In this talk, I will briefly describe the DES data and “3x2” analysis methodology. I will then focus on a few results I find particularly interesting: 1) an unexplained decorrelation between lensing and clustering amplitudes in one of our lens samples; 2) unexpectedly small galaxy intrinsic alignments; 3) consistency of results when including smaller scales and nonlinear bias. |
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mardi 8 juin 2021 - 11:15 Webinaire Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |