Lattice2010

Session

Parallel 35: Theoretical developments

15 Jun 2010, 14:30

Villasimius, Sardinia

95. Near-Integrability of Yang-Mills Theories

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,...

109. Very high order lattice perturbation theory for Wilson loops

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...

121. Glueball masses with exponentially improved statistical precision

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...

204. 5-dimensional SU(2) lattice gauge theory with Z_2 orbifolding and its phase structure

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.

217. Second Order Phase Transition in Anisotropic Lattice Gauge Theories with Extra Dimensions

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...