The role of dissipation in biasing the vacuum selection in quantum field theory at finite temperature

Details The role of dissipation in biasing the vacuum selection in quantum field theory at finite temperature The role of dissipation in biasing the vacuum selection in quantum field theory at finite temperature

2005-02-23

arxiv.org/abs/hep-ph/0502220v2

Phys.Rev. D72 (2005) 045017

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version to appear in Phys. Rev. D, 2 figures added, 2 new sub-sections

Scientific paper

10.1103/PhysRevD.72.045017

We study the symmetry breaking pattern of an O(4) symmetric model of scalar fields, with both charged and neutral fields, interacting with a photon bath. Nagasawa and Brandenberger argued that in favourable circumstances the vacuum manifold would be reduced from S^3 to S^1. Here it is shown that a selective condensation of the neutral fields, that are not directly coupled to photons, can be achieved in the presence of a minimal ``external'' dissipation, i.e. not related to interactions with a bath. This should be relevant in the early universe or in heavy-ion collisions where dissipation occurs due to expansion.

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