Out – of – equilibrium dynamics of large − N φ 4 QFT in finite volume

Out – of – equilibrium dynamics of φ 4 QFT in finite volume

99 06 55 4 v 2 1 J ul 1 99 9 Bicocca - FT - 99 - 18 Out – of – equilibrium dynamics of φ 4 QFT in finite volume

An improved time – dependent Hartree – Fock approach for scalar φ 4 QFT

The λφ 4 model in a finite volume is studied within a non–gaussian Hartree– Fock approximation (tdHF) both at equilibrium and out of equilibrium, with particular attention to the structure of the ground state and of certain dy-namical features in the broken symmetry phase. The mean–field coupled time–dependent Schroedinger equations for the modes of the scalar field are derived and the suitable...

Out of equilibrium quantum field dynamics in external fields

The quantum dynamics of the symmetry broken λ(Φ) scalar field theory in the presence of an homogeneous external field is investigated in the large N limit. We consider an initial thermal state of temperature T for a constant external field J . A subsequent sign flip of the external field, J → −J , gives rise to an out of equilibrium nonperturbative quantum field dynamics. We review here the dyn...

1 99 8 CERN - TH / 98 - 116 hep - ph / 9804237 THERMODYNAMICS OF NON - TOPOLOGICAL SOLITONS

In theories with low energy supersymmetry breaking, the effective potential for squarks and sleptons has generically nearly flat directions, V (φ) ∼ M 4 (log(φ/M)) n. This guarantees the existence of stable non-topological solitons, Q-balls, that carry large baryon number, B ≫ (M/m p) 4 , where m p is the proton mass. We study the behaviour of these objects in a high temperature plasma. We show...