4 papers · 1 filter
There is no local chiral perturbation theory at finite temperature
Stefan Leupold
For a low-temperature expansion in QCD it is well-known that the Lagrangian of vacuum chiral perturbation theory can be applied. This is due to the fact that the thermal effects of…
Determination of vector meson properties by matching resonance saturation to a constituent quark model
Stefan Leupold
The properties of mesonic resonances can be calculated in terms of the low-energy coefficients of chiral perturbation theory (chiPT) by extending unitarized chiPT to higher energie…
Stochastic interpretation of Kadanoff-Baym equations
Carsten Greiner, Stefan Leupold
We show that the nonperturbative transport equations, the so called `Kadanoff-Baym equations', within the non-equilibrium real time Green's function description can be be understoo…
Resummation of soft modes in the free energy of Phi^4 theory
Stefan Leupold
A new method is proposed for the calculation of the free energy of an N-component Phi^4 theory at finite temperature. The method combines a perturbative treatment of the hard modes…