80 citations · 603 across the 36 of their papers we have counts for
22 papers · 1 filter
Coupled scalar fields in a flat FRW universe: renormalisation
Jurgen Baacke, Laura Covi, Nina Kevlishvili
We study the non-equilibrium dynamics of a system of coupled scalar fields in a Friedmann-Robertson-Walker (FRW) universe. We consider the evolution of spatially homogeneous "class…
Scalar O(N) Model at Finite Temperature -- 2PI Effective Potential in Different Approximations
Jurgen Baacke, Stefan Michalski
We calculate the two-particle irreducible (2PI) effective potential of the O(N) linear sigma model in 1+1 dimensions. The approximations we use are the next-to-leading order of a 1…
The 2PI finite temperature effective potential of the O(N) linear sigma model in 1+1 dimensions, at next-to-leading order in 1/N
Jurgen Baacke, Stefan Michalski
We study the O(N) linear sigma model in 1+1 dimensions. We use the 2PI formalism of Cornwall, Jackiw and Tomboulis in order to evaluate the effective potential at finite temperatur…
Nonequilibrium dynamics in scalar hybrid models
Jurgen Baacke, Andreas Heinen
We study by numerical simulations the transition from the metastable "false vacuum" to the broken symmetry phase in the preheating stage after cosmic inflation in a scalar hybrid m…
O(N) linear sigma model beyond the Hartree approximation at finite temperature
J. Baacke, Stefan Michalski
We study the O(N) linear sigma model with spontaneous symmetry breaking at finite temperature in the framework of the two-particle point-irreducible (2PPI) effective action. We go…
Out-of-equilibrium evolution of quantum fields in the hybrid model with quantum back reaction
Jurgen Baacke, Andreas Heinen
The hybrid model with a scalar "inflaton" field coupled to a "Higgs" field with a broken symmetry potential is one of the promising models for inflation and (p)reheating after infl…