Lorentz gauge and Gribov ambiguity in the compact lattice U(1) theory
The Gribov ambiguity problem is studied for compact U(1) lattice theory within the Lorentz gauge. In the Coulomb phase, it is shown that apart from double Dirac sheets all gauge (i.e. Gribov) copies originate mainly from the zero-momentum modes of the gauge fields. The removal of the zero–momentum modes turns out to be necessary for reaching the absolute maximum of the gauge functional F(θ) . A new gauge fixing procedure – zero-momentum Lorentz gauge – is proposed.
Fermion propagators in U (1) lattice gauge theory
Abstract Fermion propagators are calculated for quenched compact U (1) lattice gauge theory. These vanish in the standard Landau gauge due to gauge-equivalent copies of a given field. We discuss how we remove them. Obtained fermion masses are analyzed as functions of the Wilson hopping parameter in confinement and Coulomb phases. The propagators are seen to change abruptly at K c .
A road map for European diabetes research: DIAMAP
A Road Map for Diabetes Research in Europe (DIAMAP) is a European Commission initiative to develop a strategic plan for future diabetes research in Europe. The DIAMAP project aims to identify diabetes research priorities for Europe, and will propose practical ways to integrate and co-ordinate European research expertise to focus research for the benefit of the patient.Br J Diabetes Vasc Dis;8: 299—300