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GR: Fachverband Gravitation und Relativitätstheorie
GR 7: Cosmology
GR 7.2: Talk
Tuesday, March 17, 2015, 15:40–16:00, H 2013
Coarse-grained cosmological perturbation theory: stirring up the dust model — •Cora Uhlemann1,2 and Michael Kopp1,2 — 1Arnold Sommerfeld Center, LMU Munich — 2Excellence Cluster Universe, Garching
Analytical methods for the theoretical description of large-scale structure formation are in general based on the dust model which describes cold dark matter as a pressureless fluid. We study the effect of coarse-graining the dynamics of such a pressureless selfgravitating fluid in the context of cosmological perturbation theory. The effect of the smoothing is illustrated by means of power and cross spectra for density and velocity that are computed up to 1-loop order. A prominent consequence of the coarse-graining is the generation of large-scale vorticity which is also observed in N-body simulations and has certain links to the effective field theory of large scale structure.