Gribov Confinement and Chiral Perturbation Theory
Abstract
I discuss the chiral dynamics of Gribov's theory of confinement. At a critical coupling αsc the light quark vacuum undergoes a series of phase transitions which should be taken into account in the application of chiral perturbation theory. The Gribov theory offers a simple explanation of the value of the pion nucleon sigma term without need to invoke a large strange quark component in the nucleon.
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