The Institute of Physics ( IOP ) по журналам "Journal of Physics A: Mathematical and General"
Отображаемые элементы 1-20 из 10244
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(1+1)-dimensional Hamiltonian systems as symmetry constraints of the Kadomtsev-Petviashvili equation(1992-05-21)The authors consider linear problems associated with the Kadomtsev-Petviashvili equation. They prove that the linear problems are (1+1)-dimensional Hamiltonian systems under the symmetry constraints. Moreover, they find ...
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(2000-05-05)All Lie bialgebra structures for the (1+1)-dimensional centrally extended Schrödinger algebra are explicitly derived and proved to be of coboundary type. Therefore, since all of them come from a classical r-matrix, the ...
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(1986-02-21)The author shows how to expand critical amplitudes in inverse powers of the dimensionality d. The technique, which is rather general, is applied to the classical n-vector model, with particular emphasis on the self-avoiding ...
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(1995-11-07)We model a self-interacting branched polymer by a nearest-neighbour contact model of lattice animals with either site or bond counting (k- and k'-models, respectively). 1/d-expansions for the reduced limiting free energy ...
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(2000-10-27)We give the 1/d-expansion, to order 1/d5, for the limiting reduced free energy of a weakly embedded two-variable site animal model of branched polymers. Hence, we are able to derive expansions for the free energy of related ...
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(1987-10-21)The author studies the threshold concentrations, Pq, for critical behaviour at zero temperature in the correlation functions (2q) for an Ising spin glass in which nearest-neighbour interactions randomly assume the values ...
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(1991-10-21)An open system weakly coupled to a reservoir which consists of many quantum subsystems satisfying the Wigner level fluctuation law is considered. It is argued that for such systems 1/f noise appears as a generic phenomenon.
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(1990-08-07)The series formed by time intervals between particle detections are generated by using the model wherein increasing and decreasing probabilities of particle number in a very short time interval are equivalent. These have ...
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(1985-08-21)For lattice chiral and gauge models the authors develop an 1/N2 expansion of the mean-field approximation. Special attention is paid to the free energy for which they also present as an 1/N2 expansion the effect of ...
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(1990-08-07)The authors develop systematic 1/ rho expansions for the rho -spin interaction spin-glass model in a transverse field. This model can be solved using the static approximation (SA), which is expected to be valid in the limit ...
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(1995-10-21)We consider the s-state Potts model on the diamond hierarchical lattice for large s. We show that the generalized dimensions Dq of the density of zeros supported by the associated Julia set are given by Dq = 1 - (q - ...
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(1995-03-23)According to a theory proposed in a previous paper by Lou and Hu(1994), starting from a realization of a Virasoro-type symmetry algebra, we can obtain various (2+1)-dimensional integrable models under the condition that ...
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(1999-05-21)Expansion of a Lie algebra is the opposite process to contraction. Starting from a Lie algebra, the expansion process goes to another algebra, which is non-isomorphic and less Abelian. We propose an expansion method based ...
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(1987-09-11)The authors present a transfer matrix method for calculating the properties of directed compact site animals in two dimensions. The non-degeneracy of the largest eigenvalue of a truncated 50*50 matrix implies that the ...
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(1983-05-11)The authors demonstrate, experimentally, the percolation dimensionality crossover as it is reflected in the resistivity measurements of co-evaporated Al-Ge random mixture films. The resistivity exponents as well as the ...
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(2000-01-14)We construct a family of holomorphic -functions whose renormalization group (RG) flow preserves the (2) modular symmetry and reproduces the observed stability of the Hall plateaus. The semicircle law relating the ...
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(1989-01-21)It is shown that in addition to the Jones polynomial (1985) there is another link polynomial obtained from the 2n-dimensional representation of the braid group which is related to the eight-vertex model. The degeneracy of ...
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(1975-11-01)The 32-vertex model on a triangular lattice is solved exactly in two special cases. In one case the model is reducible to a three-spin Ising model and has the exponents alpha = alpha '=2/3. The other soluble case is the ...
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(1978-12-01)The authors show that the nearest-neighbour correlations of the honeycomb, triangular, and square Ising models can be obtained by using only the star-triangle relations and simple assumptions concerning the thermodynamic ...
Отображаемые элементы 1-20 из 10244