Low-energy theorems of QCD and bulk viscosity at finite temperature and baryon density in a magnetic field
Abstract
The nonperturbative QCD vacuum at finite temperature and a finite baryon density in an external magnetic field is studied. Equations relating nonperturbative condensates to the thermodynamic pressure for T≠ 0, μq ≠ 0 and H≠ 0 are obtained, and low-energy theorems are derived. A bulk viscosity ζ(T, μ, H) is expressed in terms of basic thermodynamical quantities describing the quark-gluon matter at T≠ 0, μq ≠ 0, and H≠ 0. Various limiting cases are also considered.
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