Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Quantenfeldtheorie II

T 22.8: Talk

Friday, March 7, 2008, 15:45–16:00, KGI-HS 1016

Light Front Quantization of QED₁₊₁ at finite Temperatures — •Stefan Strauss and Michael Beyer — Institut für Physik, Universität Rostock

We consider QED₁₊₁ in the non-perturbative regime at finite temperatures. To this end, we utilize Discrete Light Cone Quantization (DLCQ) that is a regularization procedure by confining the physical system into finite box in light-like direction. This way a momentum space lattice is introduced by expanding fock states of fixed kinematical momentum K into free particle states. The system is described by the light cone hamiltonian matrix that can be solved using diagonalization methods.

In a hamiltonian framework we compute the canonical partition function and the corresponding thermodynamical potential for different system sizes L at increasing harmonic resolutions K. The double scaling continuum limit K, L→∞ is discussed. Therefore we investigate several numerical methods and compare for vanishing (strong) coupling our approaches to the analytical result of the ideal Fermi (Bose) gas. This work is relevant for the treatment of strongly coupled systems at finite temperatures such as the quark gluon plasma recently discovered at RHIC and to be investigated more closely at future CERN experiments.