Dynamical fermion algorithm for variable actions

A new version of the two-step multi-boson algorithm is developed with different fermion actions in the multi-boson and noisy Metropolis steps.Comment: 8 pages, 2 figures, more discussion and references include

Embedding the N=2 Supersymmetric Yang-Mills Theory in the Adjoint Higgs-Yukawa Model on the Lattice

The N=2 supersymmetric Yang-Mills theory is formulated on the lattice. The feasibility of numerical simulations is discussed.Comment: 11 pages with 1 figure, CERN-TH.7479/9

Violations of universality in a vectorlike extension of the standard model

Violations of universality of couplings in a vectorlike extension of the standard model with three heavy mirror fermion families are considered. The recently observed discrepancies between experiments and the standard model in the hadronic branching fractions $R_b$ and $R_c$ of the Z-boson are explained by the mixing of fermions with their mirror fermion partners.Comment: latex2e, 11 page

Multi-bosonic algorithms for dynamical fermion simulations

Multi-bosonic fermion simulation algorithms are reviewed, with particular emphasis on a recent application in SU(2) Yang-Mills theory with light gluinos.Comment: latex, 14 pages; talk given at the workshop "Molecular Dynamics on Parallel Computers", February 1999, NIC, J\"ulic

Interpolated Lattice Gauge Fields and Chiral Fermions in the Schwinger Model

The effective action induced by fermions in the chiral Schwinger model with charges (3,4,5) is investigated. Pauli-Villars regularization is combined with momentum cut-off for the evaluation of the fermion determinants on continuum gauge fields interpolated between lattice points. The convergence and gauge variance are studied numerically on gauge configurations taken from quenched updating.Comment: 11 pages, latex, 2 figures. A new reference is added and the discussion about the Landau gauge is correcte

Electroweak Phase Transition and Numerical Simulations in the SU(2) Higgs Model

Recent progress in non-perturbative investigations of the electroweak phase transition is reviewed, with special emphasis on numerical simulations in the four-dimen\-sional SU(2) Higgs model.Comment: 11 pages, latex, 2 figures. Lecture given at the $3^e$ Colloque Cosmologie, Paris, June 199

QCD spectroscopy with three light quarks

We report about a simulation using three dynamical Wilson quarks and on the progress in going to small quark masses.Comment: Lattice2001(spectrum), 3 pages, 4 figure