Dynamical Fermions with Fat Links

Abstract

We present and test a new method for simulating dynamical fermions with fat links. Our construction is based on the introduction of auxiliary but dynamical gauge fields and works with any fermionic action and can be combined with any fermionic updating. In our simulation we use an over-relaxation step which makes it effective. For four flavors of staggered fermions first results indicate that flavor symmetry at a lattice spacing a~0.2 fm is restored to a few percent. With the standard action this amount of flavor symmetry restoration is achieved at a~0.07 fm. We estimate that the overall computational cost is reduced by at least a factor 10.

11 pages, 4 figures, detailed description of over-relaxation and references added, figures with more statistics

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Cited by in corpus (19)

• Flavor Symmetry and the Static Potential with Hypercubic Blocking
• Testing the fixed-point QCD action and the construction of chiral currents
• Quenched spectroscopy with fixed-point and chirally improved fermions
• The Low-Lying Dirac Spectrum of Staggered Quarks
• One loop matching coefficients for a variant overlap action--and some of its simpler relatives
• Topological susceptibility with the improved Asqtad action
• Evaluating the Fermionic Determinant of Dynamical Configurations
• Simulation of dynamical fermions with smeared links
• Partial-Global Stochastic Metropolis Update for Dynamical Smeared Link Fermions
• Topological Susceptibility on Dynamical Staggered Fermion Configurations
• Pion wave function from lattice QCD vs. chiral quark models
• Topological susceptibility with the improved Asqtad action
• An Exact Algorithm for Any-flavor Lattice QCD with Kogut-Susskind Fermion
• Index Theorem and Random Matrix Theory for Improved Staggered Quarks
• Dynamical fermion algorithm for variable actions
• The Index Theorem and Random Matrix Theory for Improved Staggered Quarks
• The phase diagram of QCD with two and four flavors: results with HYP fermions
• Least-Squared Optimized Polynomials for Smeared Link Actions
• Topological properties of minimally doubled fermions in two space-time dimensions