Conveners
Cosmology: systematics & tensions
- Zhongxu Zhai (Shanghai Jiao Tong University)
With the newest cosmological observations there was an increase in the precision that we measure cosmological parameters. This new precision also led to the emergence of discrepancies in different measurements of these parameters, the so-called cosmological tensions. These could hint systematic effects or new physics. Also, with this increase in precision comes an inflation in the number of...
Recently, several studies reported a significant discrepancy between
the clustering and lensing of the Baryon Oscillation Spectroscopic
Survey (BOSS) galaxies in the Planck cosmology. We construct a
simple yet powerful model based on the linear theory to assess whether
this discrepancy points toward deviations from Planck. Focusing
on scales...
Precision cosmology is a very important target for the coming Stage IV weak lensing studies. It is also hard to achieve due to multiple systematical errors. In this talk we present systematics mitigation performed in 2 published papers and some ongoing works. More specifically, we present intrinsic alignment mitigation with KiDS data, and shear bias removal as well as redshift error...
