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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 18: Cosmology III

GR 18.3: Vortrag

Freitag, 20. März 2026, 11:30–11:45, KH 01.016

Cumulants in the Cosmos: Tools for Compressing the Universe — •Cora Uhlemann — Bielefeld University

Central nonlinear physics problems in cosmology can be characterized by an infinite hierarchy of cumulants. For a simple one-dimensional probability density function, the first cumulant is the mean, the second cumulant is the variance, and the higher-order cumulants capture non-Gaussian information. Cumulants thus serve as useful compression of the underlying probability density function. I will explain why characterising the higher-order cumulants is essential for beyond 2-point statistics of dark matter and show how they can be predicted by leveraging symmetries and large-deviation theory. I will then connect this to key observables in galaxy clustering and weak lensing and discuss challenges related to their survey applications.

Keywords: large-scale structure; dark matter; galaxy clustering; weak lensing; dark energy