%0 Generic
%A Führer, Florian
%D 2016
%F heidok:22221
%R 10.11588/heidok.00022221
%T Non-linear structure formation in  standard and non-standard cosmology
%U https://archiv.ub.uni-heidelberg.de/volltextserver/22221/
%X This thesis comprises research on two topics of cosmological non-linear structure  formation. One part investigates the formation of neutrino lumps in the Dark Energy  model Growing Neutrino Quintessence (GNQ). Therefor N-body simulations with  relativistic particles and non-linear scalar field equations are required. The formation  of lumps is caused by a coupling between the neutrinos and a scalar Quintessence  field. The neutrino lumps induce backreaction effects, possibly invalidating GNQ  as a Dark Energy model. We investigate if despite the backreaction effects a realistic  cosmology is possible. For a constant coupling this is hard to realize, while  we find a realistic cosmology for a varying coupling . GNQ can be tested with  cosmology by detecting the gravitational potentials of the lumps. The other part  investigates effective fluid models for ordinary structure formation of Dark Matter.  These models aim at improving perturbative methods by averaging over small scales  and taking the information on the non-perturbative dynamics on small scales from  simulations. Thereby, a renormalization procedure ensures that physical quantities  are independent of the arbitrary smoothing scale. We investigate consistency of the  renormalization procedure with the Galilean Invariance of the theory.