Low-energy relation for the trace of the energy-momentum tensor in QCD and the gluon condensate in a magnetic field
arXiv:1608.06773 · doi:10.1134/S002136401614006X
Abstract
A treatment is given of the nonperturbative QCD vacuum in a magnetic field. The low-energy equation for the trace of the energy-momentum tensor in a magnetic field is derived. It is shown that the derivatives with respect to a magnetic field of the quark and gluon contributions to the trace of the energy-momentum tensor are equal. The dependence of the gluon condensate on the magnetic field strength is derived both for strong and weak fields.
arXiv comment8 pages
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