1,115 research outputs found
The Elliptic Algebra U_{q,p}(sl_N^) and the Deformation of W_N Algebra
After reviewing the recent results on the Drinfeld realization of the face
type elliptic quantum group B_{q,lambda}(sl_N^) by the elliptic algebra
U_{q,p}(sl_N^), we investigate a fusion of the vertex operators of
U_{q,p}(sl_N^). The basic generating functions \Lambda_j(z) (j=1,2,.. N-1) of
the deformed W_N algebra are derived explicitly.Comment: 15 pages, to appear in Journal of physics A special issue - RAQIS0
The geometry of dual isomonodromic deformations
The JMMS equations are studied using the geometry of the spectral curve of a
pair of dual systems. It is shown that the equations can be represented as
time-independent Hamiltonian flows on a Jacobian bundle
A -anaolg of the sixth Painlev\'e equation
A -difference analog of the sixth Painlev\'e equation is presented. It
arises as the condition for preserving the connection matrix of linear
-difference equations, in close analogy with the monodromy preserving
deformation of linear differential equations. The continuous limit and special
solutions in terms of -hypergeometric functions are also discussed.Comment: 8 pages, LaTeX file (Two misprints corrected
Symmetries and tau function of higher dimensional dispersionless integrable hierarchies
A higher dimensional analogue of the dispersionless KP hierarchy is
introduced. In addition to the two-dimensional ``phase space'' variables
of the dispersionless KP hierarchy, this hierarchy has extra spatial
dimensions compactified to a two (or any even) dimensional torus. Integrability
of this hierarchy and the existence of an infinite dimensional of ``additional
symmetries'' are ensured by an underlying twistor theoretical structure (or a
nonlinear Riemann-Hilbert problem). An analogue of the tau function, whose
logarithm gives the function (``free energy'' or ``prepotential'' in the
contest of matrix models and topological conformal field theories), is
constructed. The infinite dimensional symmetries can be extended to this tau
(or ) function. The extended symmetries, just like those of the
dispersionless KP hierarchy, obey an anomalous commutation relations.Comment: 50 pages, (Changes: a few references are added; numbering of formulas
are slightly modified
Elliptic Deformed Superalgebra
We introduce the elliptic superalgebra as one
parameter deformation of the quantum superalgebra . For an
arbitrary level we give the bosonization of the elliptic
superalgebra and the screening currents that commute
with modulo total difference.Comment: LaTEX, 25 page
On the Vertex Operators of the Elliptic Quantum Algebra }
A realization of the elliptic quantum algebra for
any given level is constructed in terms of three free boson fields and
their accompanying twisted partners. It can be viewed as the elliptic
deformation of Wakimoto realization. Two screening currents are constructed;
they commute or anti-commute with modulo total
q-differences. The free fields realization for two types vertex operators
nominated as the type and the type vertex operators are presented. The
twisted version of the two types vertex operators are also obtained. They all
play crucial roles in calculating correlation functions.Comment: 23 page
Utilizing micro-computed tomography to evaluate bone structure surrounding dental implants: a comparison with histomorphometry
Although histology has proven to be a reliable method to evaluate the ossoeintegration of a dental implant, it is costly, time consuming, destructive, and limited to one or few sections. Microcomputed tomography (”CT) is fast and delivers three-dimensional information, but this technique has not been widely used and validated for histomorphometric parameters yet. This study compared ”CT and histomorphometry by means of evaluating their accuracy in determining the bone response to two different implant materials. In total, 32 titanium (Ti) and 16 hydroxyapatite (HA) implants were installed in 16 lop-eared rabbits. After 2 and 4 weeks, the animals were scarified, and the samples retrieved. After embedding, the samples were scanned with ”CT and analyzed three-dimensionally for bone area (BA) and bone-implant contact (BIC). Thereafter, all samples were sectioned and stained for histomorphometry. For the Ti implants, the mean BIC was 25.25 and 28.86% after 2 and 4 weeks, respectively, when measured by histomorphometry, while it was 24.11 and 24.53% when measured with ”CT. BA was 35.4 and 31.97% after 2 and 4 weeks for histomorphometry and 29.06 and 27.65% for ”CT. For the HA implants, the mean BIC was 28.49 and 42.51% after 2 and 4 weeks, respectively, when measured by histomorphometry, while it was 33.74 and 42.19% when measured with ”CT. BA was 30.59 and 47.17% after 2 and 4 weeks for histomorphometry and 37.16 and 44.95% for ”CT. Direct comparison showed that only the 2 weeks BA for the titanium implants was significantly different between ”CT and histology (p = 0.008). Although the technique has its limitations, ”CT corresponded well with histomorphometry and should be considered as a tool to evaluate bone structure around implants
Form factor expansion of the row and diagonal correlation functions of the two dimensional Ising model
We derive and prove exponential and form factor expansions of the row
correlation function and the diagonal correlation function of the two
dimensional Ising model
Quantum Lie algebras associated to and
Quantum Lie algebras \qlie{g} are non-associative algebras which are
embedded into the quantized enveloping algebras of Drinfeld and Jimbo
in the same way as ordinary Lie algebras are embedded into their enveloping
algebras. The quantum Lie product on \qlie{g} is induced by the quantum
adjoint action of . We construct the quantum Lie algebras associated to
and . We determine the structure constants and the
quantum root systems, which are now functions of the quantum parameter .
They exhibit an interesting duality symmetry under .Comment: Latex 9 page
- âŠ