Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Schwerionenkollisionen und QCD Phasen I

HK 2.6: Vortrag

Montag, 21. März 2011, 15:45–16:00, HS AP

Resummation scheme for perturbative calculations of the magnetic QCD pressure — •Daniel Bieletzki — Uni Frankfurt

Perturbation theory for non-abelian gauge theories at finite temperature is plagued by infrared divergences which are caused by magnetic soft modes ~ g²T, corresponding to gluon fields of a 3d Yang-Mills theory. While the divergences can be regulated by a dynamically generated magnetic mass on that scale, the gauge coupling drops out of the effective expansion parameter requiring summation of all loop orders for the calculation of observables. We use a scheme based on the non-linear sigma model to implement such infrared-safe resummations to estimate some of the contributions ~ g⁶ of the soft magnetic modes to the QCD pressure through three loops.