Göttingen 2025 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 10: Cosmo II

GR 10.1: Hauptvortrag

Donnerstag, 3. April 2025, 13:30–14:15, ZHG008

Probing the cosmic large-scale structure beyond the average — •Cora Uhlemann — Bielefeld University, Germany

The cosmic web of structure arises from the delicate interplay between the gravitational pull of dark matter and the accelerated expansion driven by dark energy. Galaxies form within this intricate skeleton of dark matter, making galaxy surveys powerful laboratories for exploring fundamental physics. The Euclid space telescope will map the distribution of galaxies across most of the sky, spanning over 10 billion years of cosmic history. Analysing billions of galaxies across vast cosmic volumes poses a significant big-data challenge, involving complex nonlinear physics and non-Gaussian statistics often simplified by relying on averages. I will describe how we can squeeze out more information by probing the cosmic large-scale structure beyond the average of standard forward models and statistical analyses. I will illustrate how ultralight dark matter creates quantum wave effects that dress the cosmic web and explain how it can help us to go beyond the average of standard forward models. Additionally, I will highlight the power of one-point statistics, which provide unique and complementary information to the commonly used two-point statistics, and show how these can be accurately predicted and utilised.

Keywords: cosmology; large scale structure; dark matter; dark energy; galaxy surveys