7,700 research outputs found
A new perspective on the Frenkel-Zhu fusion rule theorem
In this paper we prove a formula for fusion coefficients of affine Kac-Moody
algebras first conjectured by Walton [Wal2], and rediscovered in [Fe]. It is a
reformulation of the Frenkel-Zhu affine fusion rule theorem [FZ], written so
that it can be seen as a beautiful generalization of the classical
Parasarathy-Ranga Rao-Varadarajan tensor product theorem [PRV].Comment: 19 pages, no figures, uses conm-p-l.cls style fil
Passive Scalars and Three-Dimensional Liouvillian Maps
Global aspects of the motion of passive scalars in time-dependent
incompressible fluid flows are well described by volume-preserving
(Liouvillian) three-dimensional maps. In this paper the possible invariant
structures in Liouvillian maps and the two most interesting nearly-integrable
cases are investigated. In addition, the fundamental role of invariant lines in
organizing the dynamics of this type of system is exposed. Bifurcations
involving the destruction of some invariant lines and tubes and the creation of
new ones are described in detail.Comment: 18 pages, plain TeX, appears in Physica D, 76, 22-33, 1994. (Lack of
figures in original submission corrected in this new upload.
Radial furnace shows promise for growing straight boron carbide whiskers
Radial furnace, with a long graphite vaporization tube, maintains a uniform thermal gradient, favoring the growth of straight boron carbide whiskers. This concept seems to offer potential for both the quality and yield of whiskers
Fusion Rules for Affine Kac-Moody Algebras
This is an expository introduction to fusion rules for affine Kac-Moody
algebras, with major focus on the algorithmic aspects of their computation and
the relationship with tensor product decompositions. Many explicit examples are
included with figures illustrating the rank 2 cases. New results relating
fusion coefficients to tensor product coefficients are proved, and a conjecture
is given which shows that the Frenkel-Zhu affine fusion rule theorem can be
seen as a beautiful generalization of the Parasarathy-Ranga Rao-Varadarajan
tensor product theorem. Previous work of the author and collaborators on a
different approach to fusion rules from elementary group theory is also
explained.Comment: 43 pp, LateX, 18 postscript figures. Paper for my talk at the
Ramanujan International Symposium on Kac-Moody Lie Algebras and Applications,
ISKMAA-2002, Jan. 28-31, 2002, Chennai, India. Important references and
comments added. Final version accepted for publication. Also available from
ftp://ftp.math.binghamton.edu/pub/alex/Madras_Paper_Latex.ps.g
E11 as E10 representation at low levels
The Lorentzian Kac-Moody algebra E11, obtained by doubly overextending the
compact E8, is decomposed into representations of its canonical hyperbolic E10
subalgebra. Whereas the appearing representations at levels 0 and 1 are known
on general grounds, higher level representations can currently only be obtained
by recursive methods. We present the results of such an analysis up to height
120 in E11 which comprises representations on the first five levels. The
algorithms used are a combination of Weyl orbit methods and standard methods
based on the Peterson and Freudenthal formulae. In the appendices we give all
multiplicities of E10 occuring up to height 340 and for E11 up to height 240.Comment: 1+32 pages, 1 figure, LaTeX2e, uses longtable package;v2: corrected
typo in formula and added references, results unchanged;v3: corrected
reference [26
The 3-state Potts model and Rogers-Ramanujan series
We explain the appearance of Rogers-Ramanujan series inside the tensor
product of two basic -modules, previously discovered by the first
author in [F]. The key new ingredients are Virasoro minimal models and
twisted modules for the Zamolodchikov \WW_3-algebra.Comment: 20 pages, published in CEJ
Quantum Ergodicity and Localization in Conservative Systems: the Wigner Band Random Matrix Model
First theoretical and numerical results on the global structure of the energy
shell, the Green function spectra and the eigenfunctions, both localized and
ergodic, in a generic conservative quantum system are presented. In case of
quantum localization the eigenfunctions are shown to be typically narrow and
solid, with centers randomly scattered within the semicircle energy shell while
the Green function spectral density (local spectral density of states) is
extended over the whole shell, but sparse.Comment: 4 pages in RevTex and 4 Postscript figures; presented to Phys. Lett.
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