SB/BNL Joint Cosmo seminar: Arun Kannawadi Jayaraman, Leiden Observatory: "Cosmological results from cosmic shear measurements with KiDS+VIKING-450"

Name: SB/BNL Joint Cosmo seminar: Arun Kannawadi Jayaraman, Leiden Observatory: "Cosmological results from cosmic shear measurements with KiDS+VIKING-450"
Start: 2019-01-17T15:00:00-05:00
End: 2019-01-17T16:00:00-05:00
Location: No location set

Thursday 17 Jan 2019, 15:00 → 16:00 US/Eastern

Description

I will present the recent cosmic shear results from the combined optical+infrared data: KiDS+VIKING-450 (KV450). The tension between lensing and Planck measurements remains despite the systematics in the KV450 analysis being well-controlled. In this talk, I will mainly focus on the two main ingredients of KV450: redshift calibration and shape measurement. In particular, I show how redshift estimation is intricately coupled to shear measurement. The single largest source of uncertainty in the KV450 analysis comes from the error in shear calibration factors. Exploiting the full statistical power of future cosmic shear surveys such as Euclid and LSST will necessitate improvements to the accuracy with which the gravitational lensing signal is measured. I will end by briefly outlining some potential ideas to mitigate this uncertainty.