1983年, 第2卷, 第1期　
刊出日期：1983-01-30

  

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  MULTI-SOLITON SOLUTIONS FOR A CLASS1CAL FERROMAGNETIC CHAIN

  蒲富恪, 周欣, 李伯臧

  理论物理通讯. 1983, 2(1): 797-802.

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  In this paper we report the multisoliton solutions of Landau-Lifshitz's equation for a classical ferromagnetic chain and their asymptotic behaviors as well as the formulas of shifts of their phases and centers of mass.They include the single-and double soliton solutions as particular cases.
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  KINK AND PHASE TRANS ITION IN THREE-DIMENSIONASLY STEM WITH DOUBLE-WELL POTENTIAL

  杨振青, 常树人

  理论物理通讯. 1983, 2(1): 803-809.

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  This paper is a generalization of an article on the twodimensional system, in which the kink and phase transition were treated at a unified level. As in the two-dimensional case,there are two sorts of kink which correspond to domain walls with 90° and 180° transition angle. But unlike the two-dimensional case, there are two types of phase transition, one of which is displacive and the other is of order-disorder.
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  THE COMPOSITE PARTICLE REPRESEPITATION THEORY

  吴成礼, 冯达旋

  理论物理通讯. 1983, 2(1): 811-827.

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  Based on the composite particle representation presented in the last paper(I),a method of solving the many-body problem knpwn as the compqsite particle approximation is proposed.It is shown that a many-body system can be simplified to a composite particle system (plus one or more uncorrelated basic particles if any existed) if the following conditions are satisfied:1) the binding energies of the composite particles are much larger than the excitation energies of the system; 2)there is domination of the collective mode for the composite particles.The interac-tions between the composite particles,,as well as the interactions between composite particles and the basic particles can be evaluated from the original particle-particle interactions. Applications of this theory are indicated.
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  ABOUT THE CLUSTERIZATION OF PARTONS IN THE HADRON PROCESSES

  朱伟, 沈建国

  理论物理通讯. 1983, 2(1): 829-841.

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  In this paper the concept of the clusterizations of partons of two kinds is proposed. In terms of the model of quark recom bination and the perturbative QCD a set of distribution functions describing the clusterization of the second kind are separated from the quark fragmentation function, and so some quantitative phenomenological information about the QC3 soft processes is obtained.
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  RECOMBINATION MODEL OF SUBQUARK COLLISION AND SCALING VIOLATION IN SUPERHIGH ENERGY COLLISION

  高崇寿, 何炸麻

  理论物理通讯. 1983, 2(1): 843-855.

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  A recombination model of subquarks for superhigh energy collision is proposed.The new phenomena observed in experiments of superhigh energy cosmic ray can be explained naturally via the cascade decay of superfireballs of subquark stratum from this model.The mean multiplicity,the average transverse momentum,the distributions of both transverse and longitudinal momenta and the inclusive spectrum for the superhigh energy collision are obtained based on this model.It is shown that if the mean multiplicity of secondary particles increases as S increases according to the power law,the scaling violation should take place.Espe-cially,when the behavior of mean multiplicity changes from s⁺ to S⁺ there will be a significant jump of violation coofficient and the scaling violation.wil1 become more significant as S in-creases.It is also pointed out that the characteristic behavior of the existence of subquark stratum for the inclusive distribu-tion is almost model-independent and can be treated as a decided experimental verification of the appearance of subquark stratum,in particular,for the experiments with accelerator in the near future.
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  UNIFIED FIREBALL MODEL FOR SUBQUARK STRATUM AND POSSIBLE EXPERIMENTS CARRIED ON COLLIDING BEAM ACCELERATORS

  高崇寿, 何炸麻

  理论物理通讯. 1983, 2(1): 857-866.

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  A-unified model based on the mechanisms of scattering and recombination for quarks and subquarks is proposed. The implications of this model for different energy regions are discussed. For the low energy regions, the predictions of this model are consistent with the well-known picture given experimentally. For the superhigh energy region it can be used to explain naturally almost all the new phenomena observed in the cosmic ray experi-ments. The predictions of this model for the experiments made on the colliding beam acce1erators are discussed in detail.These predictions can be verified and used as significant evidence of the existence of these mechanisms.
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  LATTICE FORMULATION OF THE PURE GAUGE FIELDS ON COSET SPACE

  阮图南, 井思聪, 刘祖卫

  理论物理通讯. 1983, 2(1): 867-876.

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  In this paper we construct the lattice formulation of the pure gauge fields in a coset space in the cases of a group G with non-trivial topological property and of a chiral group G, and present a local gauge invariant action of a quark system on a fourdimensional Euclidean space lattice, which has the continuum limit as usual. For non-chiral group with trivial topological property, it is shown that the coset pure gauge fields have no influence on the confinement properties of the quark system by calculating latt-ice current-current propagztor when the coset pure gauge fields are retained manifest1y.
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  CN REALIZATION OF THE CHIRAL SYMMETRY IN THE LATTICE GAUGE THEORY CONTAINING THE U(I) CHIRAL GAUGE FIELD

  安瑛, 陈时, 戴元本

  理论物理通讯. 1983, 2(1): 877-882.

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  We investigate the lattice gauge theory with a gauge group UxV(1) where U is a non-Abelian group and V(1) is a chiral Abelian group.In the strong coupling approximation for the U gauge field we find that the V(1) chiral symmetry is realized through parity doublets of composite fermions for strong V(1) coupling and that it is spontaneousely broken through a techni color-like mechanism for weak V(1) coupling.
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  PROLONGATION STRUCTURE, BACKLUND TRAESFORKATION AND PRINCIPAL HOMOGENEOUS HILBERT PROBLEM IN GENERAL RELATIVITY⁺

  郭汉英, 吴可, 王世坤

  理论物理通讯. 1983, 2(1): 883-898.

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  We will briefly review the prolongation structure theory for nonlinear systems, such as nonlinear evolution equations and soli-ton equations, and its applications to the solutlon generating techniques for the gravitational fields with two commuting Killing vectors.
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  EFFECTS OF NON-RESONANCE HARMOFJICS ON SLOW EXTRACTION FROM SYNCHROTRONS

  陈利民, 方守贤, 黄楠

  理论物理通讯. 1983, 2(1): 899-906.

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  The averase effect of the non-resonance harmonics on slow extraction from synchrotrons does not vanish in a long perlod, in some cases it becomes so important that it cannot be neglected. A method based on the theory of average is emplosyed for studying the problem. The asymmetric shape of the seperatrices in the phase-plane of the third-integer resonance extractlon is expldilied. The effect of sextupole fields on the half-integer resonance extraction is analyzed in detail. It is shown that the extraction efficiency would be improved if some sextupoles are introduced properly into a half-integer resonance extraction system.
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  TWO SCALIKG RELATlOkS BETWEEN THE CRITICAL AMPLITUDES AND EXPONENTS

  刘建民

  理论物理通讯. 1983, 2(1): 907-908.

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  Two scaling relations between the thermodynamic critical amplitudes and exponents are obtained.
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  A NUMBER OF THE PERMISSIBLE PHASES FOR ISING LATTICE

  刘建民, 龚昌德

  理论物理通讯. 1983, 2(1): 909-911.

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  The catastrophe theory is applied to investigating the number of permissible phase for homogeneous-isotropic and homogeneous anisotropic Ising lattices.
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  NOTE ON EXTREMES OF SU(n) HIGGS POTENTIALS

  曹昌祺

  理论物理通讯. 1983, 2(1): 913-919.

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  The problem of symmetry breaking of Su(n) is discussed more completely with Higgs scalar fields belonging to an adjoint representation or an adjoint together with a fundamental one.
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  THE N-FOLD KERR FAMILY ARD CHARGED KERR FAMILY SOLUTIONS

  王世坤, 郭汉英, 吴可

  理论物理通讯. 1983, 2(1): 921-927.

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  The N-fold Kerr family and charged Kerr family solutions have been given in this paper by means of the inductive method to solve the principal homogeneous Hilbert problems associated with the principal inverse scattering equations, i.e., the W-equations, for both vacuum and electrovac cases with stationary axial symmetry in general relativity.
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  QUAFITIZED HALL EFFECT IM VERY STRONG MAGEETIC FIELD

  赖武彦, 沈觉涟, 苏肇冰, 于渌

  理论物理通讯. 1983, 2(1): 929-933.

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  The experimentally observed quantized Hall plateau of P_xy=3h/e² in two-dimensional electron gas, when the lowest Landau level is 1/3 filled, is discussed. The consistency of the cxtremal condition for the Hartree-Fock potential in the possible charge-density-wave state with, opening an energy gap at the Fermi level is indicated. The exactness of Such 1/3 "fractional" quantization might be justified by a modified version of Laughlin's argument based on gauge invariance.