Berlin 2005 – wissenschaftliches Programm

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T: Teilchenphysik

T 707: QCD III

T 707.3: Vortrag

Mittwoch, 9. März 2005, 14:30–14:45, TU H2037

Nonperturbative g⁶-Contribution to Free Energy of Hot QCD — •Boris Kastening — Inst. f. Theoretische Physik, FU Berlin, Arnimallee 14, 14195 Berlin

The small-coupling expansion of the free energy density of hot QCD has the form f=T⁴[c₀+c₂g²+c₃g³+(c₄′lng+c₄)g⁴+c₅ g⁵+ (c₆′lng+c₆)g⁶+⋯]. While c₀ through c₆′ may be computed within perturbation theory, c₆ receives both perturbative and nonperturbative contributions, c₆=c₆^p+c₆^np. Working within the three-dimensional pure gauge theory that describes the magnetostatic modes of hot four-dimensional non-Abelian gauge theory, we determine c₆^np. Infrared divergences are regularized by introducing a mass into gauge and ghost propagators and taking the massless limit after resummation of the corresponding perturbative series through four loops. c₆^np turns out to be of the same order of magnitude which is expected for c₆, if agreement is assumed between the small-g expansion of f and lattice results within their expected common range of validity.