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GR: Fachverband Gravitation und Relativitätstheorie

GR 12: Cosmology

GR 12.1: Vortrag

Donnerstag, 2. April 2020, 14:00–14:15, H-HS IV

Weighing neutrinos on cosmological scales with counts-in-cells — •Cora Uhlemann — DAMTP Cambridge, UK — Newcastle University, UK

Counts-in-cells statistics capture essential non-Gaussian properties of the cosmic large-scale structure, including peculiar regions of high and low density. I will show that those statistics not only provide information complementary to common two-point statistics, but also allow for accurate theoretical predictions. I will explain how matter counts-in-cells statistics and their dependence on cosmological parameters can be predicted from first principles. With a Fisher forecast for constraints on LCDM parameters and the total neutrino mass, I demonstrate the constraining power of the matter PDF and its complementarity to the matter power spectrum at mildly nonlinear scales. Finally, I will discuss how predictions for the matter PDF can be related to biased tracers and weak lensing observables.