1,090 research outputs found
A Physicist's Proof of the Lagrange-Good Multivariable Inversion Formula
We provide yet another proof of the classical Lagrange-Good multivariable
inversion formula using techniques of quantum field theory.Comment: 9 pages, 3 diagram
Quantum entanglement: The unitary 8-vertex braid matrix with imaginary rapidity
We study quantum entanglements induced on product states by the action of
8-vertex braid matrices, rendered unitary with purely imaginary spectral
parameters (rapidity). The unitarity is displayed via the "canonical
factorization" of the coefficients of the projectors spanning the basis. This
adds one more new facet to the famous and fascinating features of the 8-vertex
model. The double periodicity and the analytic properties of the elliptic
functions involved lead to a rich structure of the 3-tangle quantifying the
entanglement. We thus explore the complex relationship between topological and
quantum entanglement.Comment: 4 pages in REVTeX format, 2 figure
Analyticity of The Ground State Energy For Massless Nelson Models
We show that the ground state energy of the translationally invariant Nelson
model, describing a particle coupled to a relativistic field of massless
bosons, is an analytic function of the coupling constant and the total
momentum. We derive an explicit expression for the ground state energy which is
used to determine the effective mass.Comment: 33 pages, 1 figure, added a section on the calculation of the
effective mas
Irreducible decomposition for tensor prodect representations of Jordanian quantum algebras
Tensor products of irreducible representations of the Jordanian quantum
algebras U_h(sl(2)) and U_h(su(1,1)) are considered. For both the highest
weight finite dimensional representations of U_h(sl(2)) and lowest weight
infinite dimensional ones of U_h(su(1,1)), it is shown that tensor product
representations are reducible and that the decomposition rules to irreducible
representations are exactly the same as those of corresponding Lie algebras.Comment: LaTeX, 14pages, no figur
A nested sequence of projectors (2): Multiparameter multistate statistical models, Hamiltonians, S-matrices
Our starting point is a class of braid matrices, presented in a previous
paper, constructed on a basis of a nested sequence of projectors. Statistical
models associated to such matrices for odd are studied
here. Presence of free parameters is the crucial feature
of our models, setting them apart from other well-known ones. There are
possible states at each site. The trace of the transfer matrix is shown to
depend on parameters. For order , eigenvalues consitute
the trace and the remaining eigenvalues involving the full range of
parameters come in zero-sum multiplets formed by the -th roots of unity, or
lower dimensional multiplets corresponding to factors of the order when
is not a prime number. The modulus of any eigenvalue is of the form
, where is a linear combination of the free parameters,
being the spectral parameter. For a prime number an amusing
relation of the number of multiplets with a theorem of Fermat is pointed out.
Chain Hamiltonians and potentials corresponding to factorizable -matrices
are constructed starting from our braid matrices. Perspectives are discussed.Comment: 32 pages, no figure, few mistakes are correcte
A new eight vertex model and higher dimensional, multiparameter generalizations
We study statistical models, specifically transfer matrices corresponding to
a multiparameter hierarchy of braid matrices of dimensions
with free parameters . The simplest, case is
treated in detail. Powerful recursion relations are constructed giving the
dependence on the spectral parameter of the eigenvalues of the
transfer matrix explicitly at each level of coproduct sequence. A brief study
of higher dimensional cases () is presented pointing out features of
particular interest. Spin chain Hamiltonians are also briefly presented for the
hierarchy. In a long final section basic results are recapitulated with
systematic analysis of their contents. Our eight vertex case is
compared to standard six vertex and eight vertex models.Comment: 24 pages, 2 figures, some misprints are correcte
Tensor Operators for Uh(sl(2))
Tensor operators for the Jordanian quantum algebra Uh(sl(2)) are considered.
Some explicit examples of them, which are obtained in the boson or fermion
realization, are given and their properties are studied. It is also shown that
the Wigner-Eckart's theorem can be extended to Uh(sl(2)).Comment: 11pages, LaTeX, to be published in J. Phys.
Forecasting demand: development of a fuzzy growth adjusted holt-winters approach
Irrespective of the type of items manufactured by an industry, environment is now
becoming progressively more and more competitive than the past few decades. To sustain in this
severe competition, companies have no choice but to manage their operations optimally and in this
respect the importance of more accurate demand prediction cannot be exaggerated. This research
presents a forecasting approach tailoring the multiplicative Holt-Winters method with growth
adjustment through incorporation of fuzzy logic. The growth parameter of the time series values is
adjusted with the conventional Holt-Winters method and tested for predicting the real-life demand
of transformer tank experienced by a local company. The result obtained by applying the new
approach shows a significant improvement in the accuracy of the forecasted demand and sheds light
on further enhancement of the proposed method by optimizing other time series parameters through
fuzzy logic application for possible application in prediction of demand having trend, seasonal and
cyclical changes
First Observation of the Hadronic Transition Υ(4S)→ηhb(1P)and New Measurement of the hb(1P) and ηb(1S) Parameters
Using a sample of 771.6×106 ΥΥ(4S) decays collected by the Belle experiment at the KEKB e+e− collider, we observe, for the first time, the transition Υ(4S)→ηhb(1P) with the branching fraction B[Υ(4S)→ηhb(1P)]=(2.18±0.11±0.18)×10−3 and we measure the hb(1P) mass Mhb(1P)=(9899.3±0.4±1.0) MeV/c2, corresponding to the hyperfine (HF) splitting ΔMHF(1P)=(0.6±0.4±1.0) MeV/c2. Using the transition hb(1P)→γηb(1S), we measure the ηb(1S) mass Mηb(1S)=(9400.7±1.7±1.6) MeV/c2, corresponding to ΔMHF(1S)=(59.6±1.7±1.6) MeV/c2, the ηb(1S) width Γηb(1S)=(8+6−5±5) MeV/c2and the branching fraction B[hb(1P)→γηb(1S)]=(56±8±4)%
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