10,331 research outputs found
Recent results from Lattice QCD
Recent Lattice QCD results are reviewed with an emphasis on spectroscopic
results concerning the charm quark. It is demonstrated that, with accurate
computations from lattice QCD in recent years that can be compared with the
existing or upcoming experiments, stringent test of the Standard Model can be
performed which will greatly sharpen our knowledge on the strong interaction.Comment: 12 pages, 5 figures. Plenary talk presented at The XXXIII
international symposium on Physics in Collision (PIC2013), Institute of High
Energy Physics, Beijing, P. R. China, 03 - 07 September 201
A Mean-field Calculation for the Three-Dimensional Holstein Model
A path integral representation appropriate for further Monte Carlo
simulations is derived for the electron-phonon Holstein model in three spatial
dimensions. The model is studied within mean-field theory. Charge density wave
and superconducting phase transitions are discussed.Comment: Latex file typeset using elsart.cls, 16 pages, 2 figures, submitted
to Journal of Physics: Condensed Matte
On paratopological groups
In this paper, we firstly construct a Hausdorff non-submetrizable
paratopological group in which every point is a -set, which
gives a negative answer to Arhangel'ski\v{\i}\ and Tkachenko's question
[Topological Groups and Related Structures, Atlantis Press and World Sci.,
2008]. We prove that each first-countable Abelian paratopological group is
submetrizable. Moreover, we discuss developable paratopological groups and
construct a non-metrizable, Moore paratopological group. Further, we prove that
a regular, countable, locally -paratopological group is a discrete
topological group or contains a closed copy of . Finally, we
discuss some properties on non-H-closed paratopological groups, and show that
Sorgenfrey line is not H-closed, which gives a negative answer to
Arhangel'ski\v{\i}\ and Tkachenko's question [Topological Groups and Related
Structures, Atlantis Press and World Sci., 2008]. Some questions are posed.Comment: 14 page
Implementation of Symanzik's Improvement Program for Simulations of Dynamical Wilson Fermions in Lattice QCD
We discuss the implementation of a Sheikholeslami-Wohlert term for
simulations of lattice QCD with dynamical Wilson fermions as required by
Symanzik's improvement program. We show that for the Hybrid Monte Carlo or
Kramers equation algorithm standard even-odd preconditioning can be maintained.
We design tests of the implementation using analytically and numerically
computed cumulant expansions. We find that, for situations where the average
number of Conjugate Gradient iterations exceeds 200, the overhead is only about
20%.Comment: uuencoded gzipped tar-file, Latex2e source file, 6 Figures, 22 pages,
one reference adde
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