A Semiclassical Approach to the Strong Coupling Physics of QCD
Over the past few years, a reasonably simple picture of the workings of QCD has emerged: It assigns different physics to different distance scales via an effective coupling, g(d), governing the quantum fluctuations of scale size d. At short distances, g(d) is small, and the theory resembles a simple weak-coupling perturbation theory. The effective coupling grows with increasing d and eventually becomes large enough that the fluctuations resemble those of a strong coupling lattice theory (the value, dc, of d at which this happens is presumably roughly equal to the size of a typical hadron). The strong coupling limit of lattice QCD is almost as simple as perturbation theory: confinement is automatic and the physics is completely characterized by the energy per unit length, o, of the flux tube which connects static charges.
KeywordsStrong Coupling Wilson Loop Weak Coupling Flux Tube String Tension
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