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Condensate Structure of the Vacuum of Quantum Chromodynamics
Author(s) -
Herrmann J.
Publication year - 1987
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19874990506
Subject(s) - physics , qcd vacuum , superfluidity , vacuum energy , condensation , quantum chromodynamics , vacuum state , excited state , qed vacuum , quantum electrodynamics , particle physics , false vacuum , gluon , condensed matter physics , quantum mechanics , thermodynamics , lattice qcd
The non‐perturbative vacuum structure of quantum chromodynamies (QCD) is studied with the help of methods which are generalizations of those used to describe condensation effects and quasi‐particles in superfluid and superconductive mediums. The gluon condensation is explained by the introduction of a new vacuum state defined by a Bogoljubov transformation, leading to non‐vanishing vacuum expectation values as e.g. the gluon condensation parameter, a negative vacuum energy density, and to a gap in the energy spectrum which is connected with excited quasi‐particle states with a rest mass.