Danielle Leonard (Newcastle) - Astrophysical modelling uncertainties and late-time cosmology

When: Friday, January 27, 2023, 2:30 PM -
Where: Room 610 in G.O. Jones, and online.

Speaker: Danielle Leonard (Newcastle)

Astrophysical modelling uncertainties and late-time cosmology

Weak lensing and galaxy clustering provide crucial late-Universe constraints on cosmology. With the increased precision offered on these measurements from upcoming surveys like LSST and Euclid, we should be able to discern whether the tension in one of the key parameters of Lambda-CDM, sigma-8, is cosmological in origin or just a statistical fluke. To achieve this goal, we must ensure a robust treatment of the astrophysical uncertainties in the modelling of the weak lensing and galaxy clustering signals. This talk will first provide an introduction to weak lensing and galaxy clustering, as well as the key astrophysical modelling uncertainties at play, and then discuss several ongoing projects which seek to improve our modelling of these to the required precision for next-generation surveys.