A semi-variational approach to QCD at finite temperature and baryon density

Abstract

Recently a new bosonization method has been used to derive, at zero fermion density, an effective action for relativistic field theories whose partition function is dominated by fermionic composites, chiral mesons in the case of QCD. This approach shares two important features with variational methods: the restriction to the subspace of the composites, and the determination of their structure functions by a variational calculation. But unlike standard variational methods it treats excited states at the same time and on the same footing as the ground state. I extend this method including states of nonvanishing fermion (baryon) number and derive an effective action for QCD at finite temperature and baryon density. I test the result on a four-fermion interaction model.

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Cited by in corpus (6)

• Bogoliubov transformations and fermion condensates in lattice field theories
• Diquarks in the nilpotency expansion of QCD and their role at finite chemical potential
• Simple condensation of composite bosons in a number conserving approach to many fermion systems
• Chiral symmetry breaking and quark confinement in the nilpotency expansion of QCD
• Transfer matrix for Kogut-Susskind fermions in the spin basis
• Lattice QCD${}_2$ effective action with Bogoliubov transformations