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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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20 papers · 2 filters
Quantum Chaos in Compact Lattice QED
B. A. Berg, H. Markum, R. Pullirsch
Complete eigenvalue spectra of the staggered Dirac operator in quenched compact QED are studied on and lattices. We investigate the behavior of t…
A study of chiral symmetry in quenched QCD using the Overlap-Dirac operator
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We compute fermionic observables relevant to the study of chiral symmetry in quenched QCD using the Overlap-Dirac operator for a wide range of the fermion mass. We use analytical r…
Microscopic Spectral Density of the Dirac Operator in Quenched QCD
P. H. Damgaard, U. M. Heller, A. Krasnitz
Measurements of the lowest-lying eigenvalues of the staggered fermion Dirac operator are made on ensembles of equilibrium gauge field configurations in quenched SU(3) lattice gauge…
Spectrum of the Hermitian Wilson Dirac operator
Rajamani Narayanan
Recent results on the spectral properties of the Hermitian Wilson-Dirac operator are presented.
Heavy-Light Decay Constants: Conclusions from the Wilson Action
MILC Collaboration, C. Bernard, T. DeGrand +9
We report on the results of a MILC collaboration calculation of , , , and their ratios. We discuss the most important errors in more detail than we hav…
Light hadron spectrum with Kogut-Susskind quarks
MILC Collaboration, C. Bernard, C. DeTar +7
We made an extensive study of the light hadron spectrum using the Wilson gauge action and Kogut-Susskind quarks. Using both dynamical quarks and the quenched approximation, we dete…
Topological Susceptibility and Zero Mode Size in Lattice QCD
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We use the overlap formalism to define a topological index on the lattice. We study the spectral flow of the hermitian Wilson-Dirac operator and identify zero crossings with topolo…
Evidence for fractional topological charge in SU(2) pure Yang-Mills theory
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We investigate the spectral flows of the hermitian Wilson-Dirac operator in the fundamental and adjoint representations on two ensembles of pure SU(2) gauge field configurations at…
Non-Perturbative Improvement of the Anisotropic Wilson QCD Action
T. R. Klassen
We describe the first steps in the extension of the Symanzik O() improvement program for Wilson-type quark actions to anisotropic lattices, with a temporal lattice spacing small…
A New Exact Method for Dynamical Fermion Computations with Non-Local Actions
Ivan Horvath, A. D. Kennedy, Stefan Sint
We introduce a new algorithm which we call the {Rational Hybrid Monte Carlo} Algorithm (RHMC). This method uses a rational approximation to the fermionic kernel together with a noi…
Exotic meson spectroscopy from the clover action at beta = 5.85 and 6.15
C. Bernard, T. DeGrand, C. DeTar +6
We repeat our original simulations of the hybrid meson spectrum using the clover action, as a check on lattice artifacts. Our results for the 1-+ masses do not substantially change…
The running quark mass in the SF scheme and its two-loop anomalous dimension
Stefan Sint, Peter Weisz
The non-perturbatively defined running quark mass introduced by the ALPHA collaboration is based on the PCAC relation between correlation functions derived from the Schrödinger fun…
A Study of Practical Implementations of the Overlap-Dirac Operator in Four Dimensions
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We study three practical implementations of the Overlap-Dirac operator in four dimensions. Two implementations are based on different representations o…
Evidence for fractional topological charge in SU(2) pure Yang-Mills theory
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We investigate the spectral flows of the hermitian Wilson-Dirac operator in the fundamental and adjoint representations on two ensembles of pure SU(2) gauge field configurations at…
Continuum limit of lattice QCD with staggered quarks in the quenched approximation - a critical role for the chiral extrapolation
MILC Collaboration, Claude Bernard, Tom Blum +8
We calculate the light quark spectrum of lattice QCD in the quenched approximation using Kogut-Susskind quarks. By combining results for different lattice spacings, several volumes…
A Quark-Antiquark Condensate in Three-Dimensional QCD
P. H. Damgaard, U. M. Heller, A. Krasnitz +1
Three-dimensional lattice QCD is studied by Monte Carlo simulations within the quenched approximation. At zero temperature a quark-antiquark condensate is observed in the limit of…
The Anisotropic Wilson Gauge Action
T. R. Klassen
Anisotropic lattices, with a temporal lattice spacing smaller than the spatial one, allow precision Monte Carlo calculations of problems that are difficult to study otherwise: heav…
Ginsparg-Wilson relation and the overlap formula
Rajamani Narayanan
The fermionic determinant of a lattice Dirac operator that obeys the Ginsparg-Wilson relation factorizes into two factors that are complex conjugate of each other. Each factor is n…
Spectral flow, condensate and topology in lattice QCD
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We study the spectral flow of the Wilson-Dirac operator H(m) with and without an additional Sheikholeslami-Wohlert (SW) term on a variety of SU(3) lattice gauge field ensembles in…
The hermitian Wilson-Dirac operator in smooth SU(2) instanton backgrounds
Robert G. Edwards, Urs M. Heller, Rajamani Narayanan
We study the spectral flow of the hermitian Wilson-Dirac operator $\ham(m)$ as a function of in smooth SU(2) instanton backgrounds on the lattice. For a single instanton backgr…