Peter Orland
(Baruch, CUNY)
15/06/2010, 14:30
Theoretical developments
Gauge theories with some or all of space-time discretized may be recast as coupled integrable 1+1-dimensional
field theories, whose exact S-matrices and form factors are known. Information about the 1+1-dimensional system can be used to extract string tensions and mass spectra for weakly-coupled (but anisotropic) 2+1-dimensional gauge theories. For 3+1-dimensional gauge theories,...
Holger Perlt
(Institute for Theoretical Physics, Leipzig University)
15/06/2010, 14:50
Theoretical developments
Employing the method of numerical stochastic perturbation theory we compute Wilson loops $W_{NM}$ of moderate sizes $N \times M$ up to loop order $n=20$. Results are presented for both plaquette and tree-level Symanzik gauge actions. Based on a hyperbolic fit ansatz we investigate the convergence behaviour on finite lattice sizes for both actions. It is shown that boosted perturbation theory...
Michele Della Morte
(Institut fuer Kernphysik, Mainz)
15/06/2010, 15:10
Theoretical developments
We briefly review the computational strategy we have recently introduced for computing glueball masses and matrix elements, which achieves an exponential reduction of statistical errors compared to standard techniques. The global symmetries of the theory play a crucial role in the approach. We show how our previous work on parity can be generalized to other symmetries.
In particular we...
Hiroto So
(Ehime University)
15/06/2010, 15:30
Theoretical developments
In 5-dimensional SU(2) lattice gauge theory with Z_2 orbifolding, we find a new symmetry. It helps us to recognize the Polyakov loop as the order parameter,
because the center symmeter is trivial and useless for the loop in the system.
The vacuum structure and the application of the symmetry are also discussed.
Stam NICOLIS
(CNRS-LMPT Tours)
15/06/2010, 15:50
Theoretical developments
Field theories with extra dimensions live in a limbo. While their classical solutions have been the subject of
considerable study, their quantum aspects are difficult to control. A special class of such theories are
anisotropic gauge theories. The anisotropy was originally introduced to localize chiral fermions. Their continuum limit is of practical interest and it will be shown that the...
