752 research outputs found
Improving Dynamical Domain-Wall Fermion Simulations
We report on studies of the chiral properties of dynamical domain wall
fermions combined with the DBW2 gauge action for different gauge couplings and
fermion masses. For quenched theories, the DBW2 action gives a residual chiral
symmetry breaking much smaller than what was found with more traditional
choices for the gauge action. Our goal is to investigate the possibilities
which this and further improvements provide for the study of QCD thermodynamics
and other simulations at stronger couplings.Comment: 3 pages, 4 figures, 3 tables, Lattice2003(improve
Domain-Wall Fermions at Strong Coupling
The DWF formulation becomes increasingly problematic at gauge couplings for
which GeV, where the roughness of the gauge field leads to increased
explicit chiral symmetry breaking (\mres). This problem becomes especially
severe for sufficiently strong coupling where the underlying 4-dimensional
Wilson theory is in the Aoki phase. We review our attempts to find a suitable
modification of the gauge and/or the fermion action which would allow the DWF
method to work reliably at stronger coupling.Comment: 4 pages, 4 figures, Lattice2004(chiral
A Determination of the Essential Outcomes for Higher Education Supply Chain Management Program Success
As one of business and industries newest strategies to improve efficiency, effectiveness, and competitiveness of organizations, supply chain management is evolving into a major business school discipline. The rapid growth of SCM integration concepts enabled by information systems and technology continues to experience significant improvements and changes. These factors create challenges for higher education business schools with keeping current and driving research to advance the discipline. This study surveyed SCM corporate executives to determine if there is agreement on the core concepts that should be included in SCM curriculum, and the level of mastery program graduates should attain for success. The study also considers the potential differences in stakeholder needs dependent on SCM discipline focus or industry. The results of the study identify the SCM knowledge, skills, and abilities expected of SCM executives hiring graduates from higher education undergraduate SCM programs
How well do domain wall fermions realize chiral symmetry?
In the domain wall fermion formulation, chiral symmetry breaking in full QCD
is expected to fall exponentially with the length of the extra dimension. We
measure the chiral symmetry breaking due to a finite extra dimension in two
ways, which can be affected differently by finite volume and explicit fermion
mass. For quenched QCD the two methods generally agree, except for the largest
extent of the extra dimension, which makes the limit uncertain. We have less
data for full QCD, but see exponential suppression for the method where we have
data.Comment: 3 pages, 2 figures, LATTICE99(hightemp
Is the ice bath finally melting? CWI is no greater than active recovery upon local and systemic inflammatory cellular stress in humans.
Over the past decade, significant research has focussed on optimising the recovery of elite athletes. The premise behind such a theory is that sub-optimal recovery often leads to fatigue, reducing the quality of subsequent training sessions and/or competitive performances, whilst potentially hindering adaptive processes. There is now a plethora of research focussing on the impact of one such recovery strategy, cold-water immersion (CWI), and the benefits it may provide post-exercise
The Kaon B-parameter from Quenched Domain-Wall QCD
We present numerical results for the kaon B-parameter, B_K, determined in the
quenched approximation of lattice QCD. Our simulations are performed using
domain-wall fermions and the renormalization group improved, DBW2 gauge action
which combine to give quarks with good chiral symmetry at finite lattice
spacing. Operators are renormalized non-perturbatively using the RI/MOM scheme.
We study scaling by performing the simulation on two different lattices with
a^{-1} = 1.982(30) and 2.914(54) GeV. We combine this quenched scaling study
with an earlier calculation of B_K using two flavors of dynamical, domain-wall
quarks at a single lattice spacing to obtain
B_K(MS,NDR,mu=2GeV)=0.563(21)(39)(30), were the first error is statistical, the
second systematic (without quenching errors) and the third estimates the error
due to quenching.Comment: 77 pages, 44 figures, to be published in Phys. Rev.
Scaling of Pseudo-Critical Couplings in Two-Flavour QCD
We study the scaling behaviour of the pseudo-critical couplings for the
chiral phase transition in two-flavour QCD. We show that all existing results
from lattice simulations on lattices with temporal extent , 6 and 8
can be mapped onto a universal scaling curve. The relevant combination of
critical exponents, , is consistent with the scaling behaviour
expected for a second order phase transition with exponents. At present,
scaling according to the symmetry group can, however, not be ruled out.Comment: 8 pages, NSF-ITP 93-12
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