Marika tells us about the recent Kilo Degree Survey (KiDS) cosmological results. These are the first results from KiDS after they have reached 1000 square degrees.

Marika first explains how they know that the results are “statistics dominated” and not “systematics dominated”, meaning that the dominant uncertainty comes from statistical errors, not systematic ones.

She then presents the cosmological results, which primarily constrain the clumpiness of matter in the universe, and which therefore constrain Ω_m and σ_8. In the combined parameter “S_8”, which is constrained almost independently from Ω_m by their data they see a more than 3σ tension with the equivalent parameter one would infer from Planck.

Marika: https://www.roe.ac.uk/~ma/
Papers: https://arxiv.org/abs/2007.15632​ and https://arxiv.org/abs/2007.15633
KiDS webinar: https://www.youtube.com/watch?v=kYkN6Yl8x6M&t=0s