出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We compare two renormalization procedures, one based on the short distance behavior of heavy
quark-antiquark free energies and the other by using bare Polyakov loops at different temporal
extent of the lattice and find that both prescriptions are equivalent, resulting in renormalization
constants that depend on the bare coupling. Furthermore these renormalization constants show
Casimir scaling for higher representations of the Polyakov loops.
The analysis of Polyakov loops in different representations of the color SU(3) group indicates that
a simple perturbative inspired relation in terms of the quadratic Casimir operator is realized to a
good approximation at temperatures T>∼Tc for renormalized as well as bare loops.
In contrast to a vanishing Polyakov loop in representations with non-zero triality in the confined
phase, the adjoint loops are small but non-zero even for temperatures below the critical one. The
adjoint quark-antiquark pairs exhibit screening. This behavior can be related to the binding energy
of gluelump states.
