Quark Condensate and Effective Action from Dyson--Schwinger Equations

Authors :: Zayakin, A. V.
Khandramai, V.
Rafelski, J.
Publication Year :: 2009
Abstract: We obtain the QCD quark condensate from consideration of unquenched quark dynamics in Dyson-Schwinger gluon vacuum. We consider the non-local extension of the condensate and determine the quark virtuality. We also obtain the condensate-driven contribution of the non-perturbative QCD to Euler--Heisenberg Lagrangian of QED in external electromagnetic fields.<br />Comment: 9 pages, 10 figures