Venue: Physics
Building, Max-von-Laue-Str. 1, Seminar Room PHYS 2.116
Time: Thursday, October 26, 4:30pm (s.t.)
Contact: hees@fias.uni-frankfurt.de
We present non-perturbative first-principle results for quark-, gluon-
and meson 1PI correlation functions of two-flavour Landau-gauge QCD in
the vacuum and Yang-Mills theory at finite temperature. They are
obtained by solving their Functional Renormalisation Group equations in
a systematic vertex expansion, aiming at apparent convergence within a
self-consistent approximation scheme. These correlation functions carry
the full information about the theory and their connection to physical
observables is discussed. The presented calculations represent a crucial
prerequisite for quantitative first-principle studies of QCD and its
phase diagram within this framework. In particular, we have computed the
ghost, quark and scalar-pseudoscalar meson propagators, as well as
gluon, ghost-gluon, quark-gluon, quark, quark-meson, and meson
interactions and the magnetic and electric components of the gluon
propagator, and the three- and four-gluon vertices. Our results stress
the crucial importance of the quantitatively correct running of
different vertices in the semi-perturbative regime for describing the
phenomena and scales of confinement and spontaneous chiral symmetry
breaking without phenomenological input. We confront our results for the
correlators with lattice simulations and compare our Debye mass to hard
thermal loop perturbation theory. Finally, applications to
"QCD-enhanced" low-energy effective models of QCD are discussed.