München 2019 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 3: Cosmology I
GR 3.3: Vortrag
Dienstag, 19. März 2019, 12:00–12:15, HS 4
Structure formation with Kinetic Field Theory in the non-linear regime — •Elena Kozlikin and Matthias Bartelmann — Universität Heidelberg, Zentrum für Astronomie, Institut für Theoretische Astrophysik, Philosophenweg 12, 69120 Heidelberg
Thus far, the non-linear regime of structure formation is only accessible through expensive numerical N-body simulations since the conventional analytic treatment of cosmic density fluctuations via the hydrodynamical equations runs into severe problems even in a mildly non-linear regime. I will give an overview of a novel analytic approach to cosmic large-scale structure formation which provides a density fluctuation power spectrum that agrees well with state of the art N-body simulations up to k=10h Mpc−1. I will point out how our Kinetic Field Theory avoids the difficulties of standard perturbation theory by construction and allows to proceed deeply into the non-linear regime of density fluctuations. My main focus will be on the opportunities this method provides to study the physics behind structure formation. I will show that a delicate balance between damping and the interaction potential is required to produce the large-scale structures we observe and how ignoring this balance in perturbation schemes can give misleading results. I will further discuss how the form of the interaction potential influences the formation of structure and the implication it bears on the density profile of dark matter haloes.