The Institute of Physics ( IOP ) по журналам "Journal of Physics A: Mathematical and General"
Отображаемые элементы 120 из 15394

(1+1)dimensional Hamiltonian systems as symmetry constraints of the KadomtsevPetviashvili equation(19920521)The authors consider linear problems associated with the KadomtsevPetviashvili equation. They prove that the linear problems are (1+1)dimensional Hamiltonian systems under the symmetry constraints. Moreover, they find ...

(20000505)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 rmatrix, the ...

(19860221)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 nvector model, with particular emphasis on the selfavoiding ...

(19951107)We model a selfinteracting branched polymer by a nearestneighbour contact model of lattice animals with either site or bond counting (k and k'models, respectively). 1/dexpansions for the reduced limiting free energy ...

(20001027)We give the 1/dexpansion, to order 1/d5, for the limiting reduced free energy of a weakly embedded twovariable site animal model of branched polymers. Hence, we are able to derive expansions for the free energy of related ...

(20000825)We solve a class of attractor neural network models with a mixture of 1D nearestneighbour interactions and infiniterange interactions, which are both of a Hebbiantype form. Our solution is based on a combination of ...

(19990312)We employ Laplace and Fourier transforms in momentum space to find the bound states of the 1D Schrödinger equations with two different potentials; and . By performing inverse transforms we show that for the potential ...

(19871021)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 nearestneighbour interactions randomly assume the values ...

(19911021)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.

(19900807)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 ...

(19940621)A huge number of computers connected together form an international network (Internet). As a result of their communication, trains of data packages travel through this network; due to the limited transfer rate and the ...

(19850821)For lattice chiral and gauge models the authors develop an 1/N2 expansion of the meanfield approximation. Special attention is paid to the free energy for which they also present as an 1/N2 expansion the effect of ...

(19880707)The collective field is applied to treat higherorder terms in the 1/N expansion of the groundstate energy in the Calogero model and related O(N), U(N) and Sp(N) invariant matrix models. All these models share the common ...

(19850311)The leadingorder term of the 1/N expansion is derived in a new way and is thus given a simple physical interpretation.

(19850821)The method of largeN expansion has been applied to an attractive radial Gaussian potential to obtain its bound state energy levels. It has been shown that the shifted 1/N expansion technique provides a better approximation ...

(19850601)In a recent paper, Moreno and Zepeda (1984) have applied the 1/N expansion to obtain an approximate analytic formula for the ground state energy of a particle bound by a Yukawa potential. Using the method of Mlodinow and ...

(19861201)Using the form prescribed by Moreno and Zepeda for the Ndimensional Yukawa potential and employing the method of 1/N expansion we have obtained in a recent paper the energies of the ground state and the first excited state ...

(19900807)The authors develop systematic 1/ rho expansions for the rho spin interaction spinglass model in a transverse field. This model can be solved using the static approximation (SA), which is expected to be valid in the limit ...

(19951021)We consider the sstate 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  ...

(19950323)According to a theory proposed in a previous paper by Lou and Hu(1994), starting from a realization of a Virasorotype symmetry algebra, we can obtain various (2+1)dimensional integrable models under the condition that ...
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