Quark spectral properties above Tc from Dyson-Schwinger equations
arXiv:1009.3762 · doi:10.1140/epjc/s10052-010-1499-8
Abstract
We report on an analysis of the quark spectral representation at finite temperatures based on the quark propagator determined from its Dyson-Schwinger equation in Landau gauge. In Euclidean space we achieve nice agreement with recent results from quenched lattice QCD. We find different analytical properties of the quark propagator below and above the deconfinement transition. Using a variety of ansaetze for the spectral function we then analyze the possible quasiparticle spectrum, in particular its quark mass and momentum dependence in the high temperature phase. This analysis is completed by an application of the Maximum Entropy Method, in principle allowing for any positive semi-definite spectral function. Our results motivate a more direct determination of the spectral function in the framework of Dyson-Schwinger equations.
References in corpus (15)
- Parton transport and hadronization from the dynamical quasiparticle point of view
- Results from the Relativistic Heavy Ion Collider
- The quark-gluon vertex in Landau gauge QCD: Its role in dynamical chiral symmetry breaking and quark confinement
- QCD thermodynamics and confinement from a dynamical quasiparticle point of view
- Chiral and deconfinement transition from correlation functions: SU(2) vs. SU(3)
- Chiral and deconfinement transition from Dyson-Schwinger equations
- Linking confinement to spectral properties of the Dirac operator
- Quark-gluon vertex in general kinematics
- Plasmons, plasminos and Landau damping in a quasiparticle model of the quark-gluon plasma
- Extraction of Spectral Functions from Dyson-Schwinger Studies via the Maximum Entropy Method
- Novel Collective Excitations and the Quasi-Particle Picture of Quarks Coupled with a Massive Boson at Finite Temperature
- Spectral properties of quarks above T_c in quenched lattice QCD
- Flavor Diagonal and Off-Diagonal Susceptibilities in a Quasiparticle Model of the Quark-Gluon Plasma
- Nonperturbative contributions to the QCD pressure
- Quasi-quark spectrum in the chiral symmetric phase from the Schwinger-Dyson equation