LCDM Strikes Back: Cosmology from Year 3 of the Dark Energy Survey

by Jonathan Blazek (Northeastern University)

Wednesday 9 Jun 2021, 16:30 → 18:30 Europe/Zurich

CERN

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 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.

 

Zoom link: https://cern.zoom.us/j/98399499159
Meeting ID: 983 994 99159
Passcode: 323288