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• W2172200021 abstract "The different phases of quantum chromodynamics at finite temperature are studied. To this end the nonperturbative quark propagator in Matsubara formalism is determined from its equation of motion, the Dyson-Schwinger equation. A novel truncation scheme is introduced including the nonperturbative, temperature dependent gluon propagator as extracted from lattice gauge theory. In the first part of the thesis a deconfinement order parameter, the dual condensate, and the critical temperature are determined from the dependence of the quark propagator on the temporal boundary conditions. The chiral transition is investigated by means of the quark condensate as order parameter. In addition differences in the chiral and deconfinement transition between gauge groups SU(2) and SU(3) are explored. In the following the quenched quark propagator is studied with respect to a possible spectral representation at finite temperature. In doing so, the quark propagator turns out to possess different analytic properties below and above the deconfinement transition. This result motivates the consideration of an alternative deconfinement order parameter signaling positivity violations of the spectral function. A criterion for positivity violations of the spectral function based on the curvature of the Schwinger function is derived. Using a variety of ansatze for the spectral function, the possible quasi-particle spectrum is analyzed, in particular its quark mass and momentum dependence. The results motivate a more direct determination of the spectral function in the framework of Dyson-Schwinger equations. In the two subsequent chapters extensions of the truncation scheme are considered. The influence of dynamical quark degrees of freedom on the chiral and deconfinement transition is investigated. This serves as a first step towards a complete self-consistent consideration of dynamical quarks and the extension to finite chemical potential. The goodness of the truncation is verified first at vanishing chemical potential. Interestingly, besides good agreement of the transition temperatures with lattice QCD calculations, the different deconfinement criteria of the dual condensate and of the Schwinger-function yield similar results. In the following, the effects of a finite quark chemical potential are studied. These calculations allow for a first insight on the dual condensate at finite chemical potential beyond mean-field calculations in phenomenological models. In addition, a possibility to include the back-reaction of long-range fluctuations in the vicinity of a second order phase transition is elaborated. In the scaling region constraints for a self-consistent solution arise from an analytic investigation." @default.
• W2172200021 created "2016-06-24" @default.
• W2172200021 creator A5049057967 @default.
• W2172200021 date "2015-05-05" @default.
• W2172200021 modified "2023-09-27" @default.
• W2172200021 title "A Dyson-Schwinger Approach to Finite Temperature QCD" @default.
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