The role of dissipation in biasing the vacuum selection in quantum field theory at finite temperature
arXiv:hep-ph/0502220 · doi:10.1103/PhysRevD.72.045017
Abstract
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.
arXiv commentFinal version to appear in Phys. Rev. D, 2 figures added, 2 new sub-sections
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