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from Part II - Construction of The Standard Model
Published online by Cambridge University Press: 06 February 2025
The gluon SU(3) gauge field is studied, with “quarks” only as static sources. We describe confinement by referring to the Wegner–Wilson loop and its strong-coupling expansion on the lattice. The way back to the continuum is related to asymptotic freedom. We discuss the strength of the strong interaction, its low-energy string picture, and the Luescher term as a Casimir effect. The Fredenhagen–Marcu operator provides a sound confinement criterion. In the confined phase we discuss the glueball spectrum, the Polyakov loop, and center symmetry. We also consider deconfinement at high temperature, and finally the case of a G(2) gauge group instead of SU(3).
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