Thu·Sep 15, 2005Thursday·September 15, 2005

1. 01*

   Evolution of the Structure Factors in Pure SU(N) Lattice Gauge Theory and Effective Spin Models

   A. Bazavov🇺🇸 · B.A. Berg🇺🇸 · A. Velytsky🇺🇸

   We consider model A dynamics for a quench from the disordered into the ordered phase of SU(3) lattice gauge theory and the analogue 3d 3-state Potts model. For the gauge model this corresponds to a rapid heating from the confined to the deconfined phase. The exponential growth factors of low-lying structure function modes are numerically calculated. The linear theory of spinodal decomposition is used to determine the critical modes. This allows for the Debye screening mass estimation in an effective phenomenological model. The quench leads to competing vacuum domains, which make the equilibration of the QCD vacuum after the heating non-trivial. The influence of such domains on the gluonic energy density is studied.

   hep-latInt.J.Mod.Phys.A(2005)·7 citations
2. 02*

   Another weak first order deconfinement transition: three-dimensional SU(5) gauge theory

   Kieran Holland🇺🇸

   We examine the finite-temperature deconfinement phase transition of (2+1)-dimensional SU(5) Yang-Mills theory via non-perturbative lattice simulations. Unsurprisingly, we find that the transition is of first order, however it appears to be weak. This fits naturally into the general picture of "large" gauge groups having a first order deconfinement transition, even when the center symmetry associated with the transition might suggest otherwise.

   hep-latJHEP(2006)·30 citations
3. 03*

   Two Loop Partially Quenched and Finite Volume Chiral Perturbation Theory Results

   Johan Bijnens🇸🇪 · Niclas Danielsson🇸🇪 · Karim Ghorbani🇸🇪 · Timo Lähde (Lund)🇸🇪

   This talk presents some results relevant for lattice QCD at higher order in ChPT. First we discuss the finite volume corrections at two loops for the quark condensate as well as a Lüscherlike finite volume formula for it. The latter allows for an alternative determination of meson sigma terms. The second set of results presented here are the calculations at two loops in partially quenched chiral perturbation theory of masses and decay constants of the charged mesons. We present results for all relevant quark mass combinations for the cases with two and three sea quarks.

   hep-latPoS(2006)·6 citations
4. 04*

   Cutoff effects in the O(N) sigma model at large N

   Ulli Wolff🇩🇪 · Francesco Knechtli🇩🇪 · Bjoern Leder🇩🇪 · Janos Balog🇭🇺

   The computation of the step scaling function for the finite size mass-gap in the O(N) sigma model at large N is reviewed. Practically exact nonperturbative results become available for both finite and vanishing lattice spacing. We use them as a testbed to investigate standard procedures of continuum extrapolation in lattice field theory.

   hep-latPoS(2006)·3 citations
5. 05*

   Two-loop evaluation of large Wilson loops with overlap fermions: the b-quark mass shift, and the quark-antiquark potential

   A. Athenodorou🇨🇾 · H. Panagopoulos (Dept. of Physics, University of Cyprus, Nicosia)🇨🇾

   We compute, to two loops in pertubation theory, the fermionic contribution to rectangular RxT Wilson loops, for different values of R and T. We use the overlap fermionic action. We also employ the clover action, for comparison with existing results in the literature. In the limit R, T -> Infinity our results lead to the shift in the b-quark mass. We also evaluate the perturbative static potential as T -> Infinity.

   hep-latPoS(2006)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.