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42 papers · 1 filter
On the Dynamics of Light Quarks in QCD
Khalil Bitar, Robert G. Edwards, Urs M. Heller +1
We describe recent results concerning the behavior of lattice QCD with light dynamical Wilson and Staggered quarks. We show that it is possible to reach regions of parameter space…
Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion
M. Troyer, H. Tsunetsugu, T. M. Rice +2
The one-dimensional t-J model with density-density repulsive interactions is investigated using exact diagonalization and quantum Monte Carlo methods. A short-range repulsion pushe…
Progress in Lattice Field Theory Algorithms
A. D. Kennedy
I present a summary of recent algorithmic developments for lattice field theories. In particular I give a pedagogical introduction to the new Multicanonical algorithm, and discuss…
Possible Failure of Asymptotic Freedom in Two-Dimensional and -Models
S. Caracciolo, R. G. Edwards, A. Pelissetto +1
We have simulated the two-dimensional and -models, at correlation lengths up to about 220 (resp.\ 30), using a Wolff-type embedding algorithm. We see no evidence o…
Dynamical Properties of a Single Hole in an Antiferromagnet
Didier Poilblanc, Timothy Ziman, H. J. Schulz +1
A finite size scaling analysis of the spectral function and of the optical conductivity of a single hole moving in an antiferromagnetic background is performed. It is shown that bo…
Basis Set Reduction Applied to the Two Dimensional t-Jz Model
Jose Riera, Elbio Dagotto
A simple variation of the Lanczos method is discussed. The new technique is based on a systematic reduction of the size of the Hilbert space of the model under consideration. As an…
Indications of d_{x^2 - y^2} Superconductivity in the Two Dimensional t-J Model
Elbio Dagotto, Jose Riera
Superconducting correlations in the two dimensional model at zero temperature are evaluated using numerical techniques. At the fermionic density $\langle n \rangle \sim…
Cluster Algorithm for Vertex Models
H. G. Evertz, G. Lana, M. Marcu
We present a new type of cluster algorithm that strongly reduces critical slowing down in simulations of vertex models. Since the clusters are closed paths of bonds, we call it the…
Final-State Interaction of Longitudinal Vector Bosons
J. -L. Basdevant, E. L. Berger, D. Dicus +2
In the standard Higgs model of electroweak symmetry breaking, the Higgs boson is associated with both vector-boson and fermion mass generation. In contrast, we discuss a two-Higgs-…
Hadron Spectroscopy with Dynamical Wilson Fermions at beta=5.3
K. M. Bitar
We present results from simulations of lattice QCD using two flavors of dynamical Wilson fermions at a lattice coupling on lattices at two hopping paramete…
Narrow band noise as a model of time-dependent accelerations: study of the stability of a fluid surface in a microgravity environment
Jaume Casademunt, Wenbin Zhang, Jorge Vinals +1
We introduce a stochastic model to analyze in quantitative detail the effect of the high frequency components of the residual accelerations onboard spacecraft (often called g-jitte…
The , channel of the O(4) theory
Khalil M. Bitar, Pavlos Vranas
A Monte Carlo simulation of the theory in the broken phase is performed on a hypercubic lattice in search of an , resonance. We investigate the region of t…
Regularization dependence of the Higgs mass triviality bound
Urs M. Heller, Markus Klomfass, Herbert Neuberger +1
We calculate the triviality bound on the Higgs mass in scalar field theory models whose global symmetry group has been replaced…
Generalized spin density wave state of the Hubbard model on the C12 and C60 clusters
L. Bergomi, J. P. Blaizot, Th. Jolicoeur +1
The one-band Hubbard model at half-filling on a truncated tetrahedron (C), and on the C molecule is studied. Within the Hartree-Fock approximation, we find a magnetic…
Multicanonical Study of the 3D Ising Spin Glass
B. A. Berg, T. Celik, U. Hansmann
We simulated the Edwards-Anderson Ising spin glass model in three dimensions via the recently proposed multicanonical ensemble. Physical quantities such as energy density, specific…
Study of spiral pattern formation in Rayleigh-Benard convection
Hao-wen Xi, J. D. Gunton, Jorge Vinals
We present a numerical study of a generalized two-dimensional Swift-Hohenberg model of spiral pattern formation in Rayleigh-Bénard convection in a non-Boussinesq fluid. We demonstr…
Scaling and Asymptotic Scaling in the SU(2) Gauge Theory
J. Fingberg, U. M. Heller, F. Karsch
We determine the critical couplings for the deconfinement phase transition in gauge theory on lattices with and 16 and varying between 16 a…
Asymptotic Freedom and Euclidean Quantum Gravity
Bernd A. Berg, Balasubramanian Krishnan, Mohammad Katoot
Pure SU(2) gauge theory is the simplest asymptotically free theory in four dimensions. To investigate Euclidean quantum gravity effects in a fundamental length scenario, we simulat…
The triviality bound on the Higgs mass; its value and what it means
H. Neuberger, U. M. Heller, M. Klomfass +1
Older lattice work exploring the Higgs mass triviality bound is briefly reviewed. It indicates that a strongly interacting scalar sector in the minimal standard model cannot exist;…
Comparison of Lattice Coulomb Gauge Wave Functions in Quenched Approximation and with Dynamical Fermions
M. Hecht
We present a comparison of Coulomb gauge wave functions from quenched simulations with two simulations which include the effects of dynamical fermions: simulations wi…
A Lower Bound on in the O(4) Model on Anisotropic Lattices
R. V. Gavai, U. M. Heller, F. Karsch +2
Results of an investigation of the spin model at finite temperature using anisotropic lattices are presented. In both the large approximation and numerical simulations u…
Large analysis of the Higgs mass triviality bound
Urs M. Heller, Herbert Neuberger, Pavlos Vranas
We calculate the triviality bound on the Higgs mass in scalar field theory models whose global symmetry group has been replaced…
Multicanonical Spin Glass Simulations
B. A. Berg, T. Celik
We report a Monte Carlo simulation of the Edwards-Anderson spin glass model within the recently introduced multicanonical ensemble. Replica on lattices of size up to $L=…
The Topological Susceptibility of the Lattice CP(n-1) Model on the Torus and the Sphere
N. Schultka, M. Müller-Preussker
The topological vacuum structure of the two-dimensional model for is studied on the lattice. In particular we investigate the small-volume limit on the t…