Lattice2010

Session

Parallel 23: Chiral symmetry

15 Jun 2010, 08:30

Villasimius, Sardinia

5. Magnetic-Field-Induced insulator-conductor transition in quenched lattice gauge theory

Pavel Buividovich (ITEP (Moscow, Russia) and JINR (Dubna, Russia))

15/06/2010, 08:30

Chiral symmetry

We study the correlator of two vector currents in quenched lattice gauge theory with chirally invariant lattice Dirac operator with constant external magnetic field. It is found that in the confinement phase the correlator of the components of the current parallel to the magnetic field decays much slower than in the absence of magnetic field, while for other components the correlation length...

211. QCD Rotator with Light Quarks up to NNL Order

Manuel Weingart (Institute for Theoretical Physics, University of Bern)

15/06/2010, 08:50

Chiral symmetry

We consider 2-flavour QCD with light quark masses in a small spatial box, where the low lying excitations are that of an $O(4)$ rotator. This problem can be treated in chiral perturbation theory ($\delta$-regime). Up to NNL order the final result depends only on a few low energy constants $F$, ${\mathrm{\Lambda }}_1$, ${\mathrm{\Lambda }}_2$ and $B$. Comparing these results with that of numerical simulations in QCD...

239. Brillouin improvement for Wilson fermions

Giannis Koutsou (University of Wuppertal and Juelich Supercomputing Center)

15/06/2010, 09:10

Chiral symmetry

We present a Wilson type operator obtained by including terms in both the Laplacian as well as the first-derivative stencil, such that the resulting operator remains within a hypercube. Motivated by the effect this improvement has on the eigenvalue spectrum, we investigate the approach to the continuum limit of several physical quantities. Throughout we compare to the standard Wilson operator.

14. Low-energy constants from Dirac eigenvalue correlators at NNLO in the epsilon expansion

Christoph Lehner (RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, NY-11973, USA)

15/06/2010, 09:30

Chiral symmetry

We calculate the next-to-next-to-leading order (NNLO) contributions in the epsilon expansion with a small imaginary chemical potential and discuss their relevance to Dirac eigenvalue correlators. We show how to minimize systematic deviations from random-matrix theory by an optimal choice of lattice geometry in the case of two light quark flavors. Finally, we determine the low-energy...