12,115 research outputs found
A note on the solutions of the Ginsparg-Wilson relation
The role of R in the solutions of the Ginsparg-Wilson relation is discussed.Comment: LaTeX, 12 pages, 4 figures, Equation (11) has been symmetrized to
satisfy the hermiticity conditio
Quark Mass Matrices with Four and Five Texture Zeroes, and the CKM Matrix, in terms of Mass Eigenvalues
Using the triangular matrix techniques of Kuo et al and Chiu et al for the
four and five texture zero cases, with vanishing (11) elements for U and D
matrices, it is shown, from the general eigenvalue equations and hierarchy
conditions, that the quark mass matrices, and the CKM matrix can be expressed
(except for the phases) entirely in terms of quark masses. The matrix
structures are then quite simple and transparent. We confirm their results for
the five texture zero case but find, upon closer examination of all the CKM
elements which our results provide, that six of their nine patterns for the
four texture zero case are not compatible with experiments. In total, only one
five-texture zero and three four-texture zero patterns are allowed.Comment: 15 pages, 3 table
A construction of chiral fermion action
According to the necessary requirements for a chirally symmetric Dirac
operator, we present a systematic construction of such operators. We formulate
a criterion for the hermitian operator which enters the construction such that
the doubled modes are decoupled even at finite lattice spacing.Comment: 6 page
The Index of a Ginsparg-Wilson Dirac operator
A novel feature of a Ginsparg-Wilson lattice Dirac operator is discussed.
Unlike the Dirac operator for massless fermions in the continuum, this lattice
Dirac operator does not possess topological zero modes for any
topologically-nontrivial background gauge fields, even though it is
exponentially-local, doublers-free, and reproduces correct axial anomaly for
topologically-trivial gauge configurations.Comment: 8 pages, minor changes, the version to appear in Phys. Lett.
The Index and Axial Anomaly of a lattice Dirac operator
A remarkable feature of a lattice Dirac operator is discussed. Unlike the
Dirac operator for massless fermions in the continuum, this Ginsparg-Wilson
lattice Dirac operator does not possess topological zero modes for any
topologically-nontrivial background gauge fields, even though it is
exponentially-local, doublers-free, and reproduces correct axial anomaly for
topologically-trivial gauge configurations.Comment: 3 pages, LaTex, Lattice2001(chiral
Henri Temianka correspondence; (Chiu)
This collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/3889/thumbnail.jp
Effects of Dietary Sodium Intake on Blood Flow Regulation During Exercise in Salt Resistant Individuals
PURPOSE: Dietary sodium intake guidelines is ≤2,300 mg/day, yet is exceeded by 90% of Americans. This study examined the impact of a high sodium diet on blood flow regulation during exercise. METHODS: Six males (25 ± 2 years) consumed dietary sodium intake guidelines for two weeks, with one week salt-capsule supplemented (HS: 6,900 mg/day of sodium) and the other week placebo-capsule supplemented (LS: 2,300 mg/day of sodium). At the end of each week, peripheral hemodynamic measurements [blood flow (BF), shear rate (SR), and flow mediated dilation (FMD)/SR)] of the brachial and superficial femoral artery were taken during handgrip (HG) and plantar flexion (PF) exercise, respectively. Each exercise workload was 3 minutes and progressed by 8 kilograms until exhaustion. RESULTS: There were no differences between LS and HS in blood pressure (82 ± 4 v 80 ± 5 mmHg; p = 0.3) or heart rate (56 ± 6 v 59 ± 10 bpm; p = 0.4). HG and PF exercise increased BF, SR, and FMD/SR across workload (p \u3c 0.03 for all), but no difference between diets (p \u3e 0.05 for all). CONCLUSION: Despite previous reports that HS impairs resting vascular function, this study revealed that peripheral vascular function and blood flow regulation during exercise is not impacted by a HS diet.https://scholarscompass.vcu.edu/gradposters/1082/thumbnail.jp
Ginsparg-Wilson relation with R=(a \gamma_5 D)^{2k}
The Ginsparg-Wilson relation
with is discussed. An explicit realization of D is
constructed. It is shown that this sequence of topologically-proper lattice
Dirac operators tend to a nonlocal operator in the limit . This
suggests that the locality of a lattice Dirac operator is irrelevant to its
index.Comment: 4 pages, 1 EPS figure, talk presented at Lattice'00 (Chiral Fermion
Some remarks on the Ginsparg-Wilson fermion
We note that Fujikawa's proposal of generalization of the Ginsparg-Wilson
relation is equivalent to setting in the original
Ginsparg-Wilson relation . An
explicit realization of D follows from the Overlap construction. The general
properties of D are derived. The chiral properties of these higher-order (k >
0) realizations of Overlap Dirac operator are compared to those of the
Neuberger-Dirac operator (k = 0), in terms of the fermion propagator, the axial
anomaly and the fermion determinant in a background gauge field. Our present
results (up to lattice size 16 x 16) indicate that the chiral properties of the
Neuberger-Dirac operator are better than those of higher-order ones.Comment: 20 pages, minor changes in v3, to appear in Nucl. Phys.
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