APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Benjamin Joachimi (UCL)
Title: The Inconsistent Universe: Problems with KiDS, or with LambaCDM?
Date: Tue, Mar 19, 2019, 12:00 - 13:00
Place: Seminar Room A
Abstract: Recent measurements of the cosmic microwave background by Planck and by galaxy weak lensing surveys at low redshift have resulted in a marginal, yet intriguing discrepancy in the amplitude of matter density fluctuations, one of the fundamental parameters of the cosmological concordance model. I will present the most recent results of cosmological weak lensing analysis from the ESO Kilo-Degree Survey (KiDS), which has attained unprecedented robustness to systematic effects and confirms the mild tension with Planck. I will discuss the consistency of these results with other weak lensing surveys and with complementary probes of large-scale structure. Moreover, I will present new approaches to asserting the consistency of correlated datasets and demonstrate that there is no evidence for internal tension in KiDS weak lensing data.