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GR: Fachverband Gravitation und Relativitätstheorie

GR 3: Cosmology I

GR 3.5: Vortrag

Dienstag, 19. März 2019, 12:30–12:45, HS 4

Higher order statistics of cosmic density fluctuations with Kinetic Field Theory — •Sara Konrad and Matthias Bartelmann — Universität Heidelberg, Zentrum für Astronomie, Institut für theoretische Astrophysik

Computing third- and higher-order power spectra of the cosmic density fluctuations is of great interest for our understandig of cosmic structure formation, since polyspectra contain information about the non-gaussianity of the cosmic density field. Furthermore, in order to determine the likelihood of a cosmological model from measured n-point correlation functions, 2n-point correlation functions are necessary. However, up to now, no standard methods exist to compute non-linear polyspectra analytically for arbitrary scales, and obtaining them from simulations is computationally demanding. Our Kinetic Field Theory is a novel approach to describe non-linear structure formation analytically beyond shell crossing. In this talk I present an analytical closed expression for the non-linear free-streaming solution for polyspectra of arbitrary order, emerging from gaussian initial conditions. Furthermore, I show current approaches on how the non-linear evolution due to interactions can be incorporated and present first results for the cosmic bispectrum.