University of Cambridge > Talks.cam > Cosmology Lunch > Andrej Dvornik & Constance Mahony - KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing - featuring beyond-linear halo bias

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Andrej Dvornik & Constance Mahony - KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing - featuring beyond-linear halo bias

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If you have a question about this talk, please contact Dongwon Han .

Zoom link: https://zoom.us/j/94286005192

We present constraints on the flat ΛCDM cosmological model through a joint analysis of galaxy abundance, galaxy clustering and galaxy-galaxy lensing observables with the Kilo-Degree Survey. Our theoretical model combines a flexible conditional stellar mass function, to describe the galaxy-halo connection, with a cosmological N-body simulation-calibrated halo model to describe the non-linear matter field. First, we will introduce the halo model and present a vital correction to the underlying assumptions – beyond-linear halo bias. Then we will present our cosmological results and show that they are comparable to, and consistent with, joint ‘3×2pt’ clustering-lensing analyses that additionally include a cosmic shear observable. This analysis therefore brings attention to the significant constraining power in the often-excluded non-linear scales for galaxy clustering and galaxy-galaxy lensing observables.

This talk is part of the Cosmology Lunch series.

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