63,714 research outputs found
Finite Temperature Transition in Two Flavor QCD with Renormalization Group Improved Action
The finite temperature transition or crossover in QCD with two degenerate
Wilson quarks is investigated using a renormalization group improved action. At
and 2.1 where GeV, the expectation value of
the Polyakov loop and the pion screening mass on an lattice vary
smoothly with the hopping parameter through the transition/crossover. The quark
screening mass in the high temperature phase agrees well with that in the low
temperature phase calculated on an lattice. The smooth transition of the
observables is totally different from the sharp transition found for the
standard action at and 5.1 where is also GeV.Comment: 3 pages, latex, 2 postscript figures. Contribution to Lattice 94
proceeding
Transition Probability to Turbulent Transport Regime
Transition phenomena between thermal noise state and turbulent state observed
in a submarginal turbulent plasma are analyzed with statistical theory.
Time-development of turbulent fluctuation is obtained by numerical simulations
of Langevin equation which contains hysteresis characteristics. Transition
rates between two states are analyzed. Transition from turbulent state to
thermal noise state occurs in entire region between subcritical bifurcation
point and linear stability boundary.Comment: 9 pages, 6 figures, to be published in Plasma Phys. Control. Fusio
Phase Diagram of QCD at Finite Temperatures with Wilson Fermions
Phase diagram of QCD with Wilson fermions for various numbers of flavors
is discussed. Our simulations mainly performed on a lattice with the
temporal size indicate the following: The chiral phase transition is
of first order when , while it is continuous when . For
the realistic case of massless u and d quarks and the strange quark with MeV, the phase transition is first order. The sharp transition in the
intermediate mass region for at observed by the MILC group
disappears when an RG improvement is made for the pure gauge action.Comment: ps file, 7 pages with 5 figures, contribution to Lattice 94
Stochastic Transition between Turbulent Branch and Thermodynamic Branch of an Inhomogeneous Plasma
Transition phenomena between thermodynamic branch and turbulent branch in
submarginal turbulent plasma are analyzed with statistical theory.
Time-development of turbulent fluctuation is obtained by numerical simulations
of Langevin equation which contains submarginal characteristics. Probability
density functions and transition rates between two states are analyzed.
Transition from turbulent branch to thermodynamic branch occurs in almost
entire region between subcritical bifurcation point and linear stability
boundary.Comment: 10 pages, 8 figures, to be published in J. Phys. Soc. Jp
Site-selective Cu NMR study of the vortex cores of TlBaCuO
We report site-selective Cu NMR studies of the vortex core states of
an overdoped TlBaCuO with = 85 K. We observed
a relatively high density of low-energy quasi-particle excitations at the
vortex cores in a magnetic field of 7.4847 T along the c axis, in contrast to
YBaCuO.Comment: 5 pages, 6 figures, submitted to J. Phys. Chem. Solids (QuB2006,
Tokai
7Li NMR Studies of LiCrO2
We report on 7Li NMR studies of a spin S = 3/2 triangular lattice
antiferromagnet LiCrO2 (Neel temperature TN = 62 K) in the paramagnetic state
by using the free-induction decay of 7Li nuclear magnetization. We observed
critical divergence of the 7Li nuclear spin-lattice relaxation rate 1/T1 near
TN, a narrow critical region, and a critical exponent w = 0.45 from a fit of
1/T1 (T/TN - 1). Although spin frustration effects have been
explored for this system, the dynamical critical phenomena suggest that LiCrO2
in the critical region is a poor low dimensional antiferromagnetic system.Comment: 6 pages, 4 figures, to appear in JPS Conf. Proc. (SCES2013
A -analogue of derivations on the tensor algebra and the -Schur-Weyl duality
This paper presents a -analogue of an extension of the tensor algebra
given by the same author. This new algebra naturally contains the ordinary
tensor algebra and the Iwahori-Hecke algebra type of infinite degree.
Namely this algebra can be regarded as a natural mix of these two algebras.
Moreover, we can consider natural "derivations" on this algebra. Using these
derivations, we can easily prove the -Schur-Weyl duality (the duality
between the quantum enveloping algebra of the general linear Lie algebra and
the Iwahori-Hecke algebra of type ).Comment: 10 pages; revised version; to appear in Lett. Math. Phy
Random Sequential Generation of Intervals for the Cascade Model of Food Webs
The cascade model generates a food web at random. In it the species are
labeled from 0 to , and arcs are given at random between pairs of the
species. For an arc with endpoints and (), the species is
eaten by the species labeled . The chain length (height), generated at
random, models the length of food chain in ecological data. The aim of this
note is to introduce the random sequential generation of intervals as a Poisson
model which gives naturally an analogous behavior to the cascade model
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