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.
Gauge fixing, zero-momentum modes and the calculation of masses on a lattice
Abstract It is shown that the zero-momentum modes can strongly affect the values of the masses, for example the magnetic screening mass m m , calculated from gauge-dependent correlators with zero momentum.
Sterilization: A Comparative Review
Summary: Publications relating to surgical procedures for sterilization have been reviewed, and the incidences of complications and subsequent pregnancies compared.