Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory
Abstract not provided
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Engineering topics
Osborn, J C
Publications and source records attributed to Osborn, J C.
Parity Doubling and the S Parameter Below the Conformal Window
We describe a lattice simulation of the masses and decay constants of the lowest-lying vector and axial resonances, and the electroweak S parameter, in an SU(3) gauge theory with N{sub f} = 2 and 6 fermions in the fundamental representation. The spectrum becomes more parity doubled and the S parameter per electroweak doublet decreases when N{sub f} is increased from 2 to 6, motivating study of these trends as N{sub f} is increased further, toward the critical value for transition from confinement to infrared conformality.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Adaptive Multigrid Algorithm for the Lattice Wilson-Dirac Operator
We present an adaptive multigrid solver for application to the non-Hermitian Wilson-Dirac system of QCD. The key components leading to the success of our proposed algorithm are the use of an adaptive projection onto coarse grids that preserves the near null space of the system matrix together with a simplified form of the correction based on the so-called {gamma}{sub 5}-Hermitian symmetry of the Dirac operator. We demonstrate that the algorithm nearly eliminates critical slowing down in the chiral limit and that it has weak dependence on the lattice volume.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗