Current challenges and future opportunities from weak lensing: The S8 tension

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• Alexandra Amon (KICC)
• Monday 27 February 2023, 13:00-14:00
• CMS, Pav. B, CTC Common Room (B1.19) [Potter Room].

If you have a question about this talk, please contact Inigo Zubeldia.

Weak lensing surveys have consistently reported low values of the clustering amplitude (S_8) compared to that predicted by Planck primary Cosmic Microwave Background. I present the constraints from the Dark Energy Survey (DES) cosmic shear analysis from >100 million galaxies spanning >4000 square degrees, constituting the most powerful weak lensing dataset to date. I’ll emphasise the robustness to the main systematics that weak lensing analyses are susceptible to, such as the redshift and shear calibration, as well as the modelling of astrophysical effects. I will present a potential solution to the S8 tension and the roadmap underway to tackle this, and exploit the full potential of upcoming experiments.

This talk is part of the Cosmology Lunch series.

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