1982年, 第1卷, 第6期　
刊出日期：1982-11-30

  

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  ON AN APPROXIMATE FORM OF THE COUPLED EQUATIONS OF THE ORDER PARAMETER WITH THE WEAK ELECTROMAGNETIC FIELD FOR THE IDEAL SUPERCONDUCTOR

  苏肇冰, 周光召

  理论物理通讯. 1982, 1(6): 669-679.

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  A simplified derivation of the macroscopic electrodynamic equations of Umezawa, Hancini et al. for superconductors is given in the framework of the closed time path Green's functions (CTPGF)using generalized Ward-Takahashi identities. It is shown that the forms of the equations obtained are the same for both thermoe quilibrium and nonequilibrium stationary states provided the electromagnetic field is weak and its effect on the modulus of the order parameter can be neglected. The statistical behavior of the states is completely specified in the equations by parameters which can be calculated by the method of CTPGF.
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  THE LONGITUDINAL CRITICAL CURRENT OF A THIN FILM OF TYPE Ⅱ SUPERCONDUCTORS

  吴杭生, 顾一鸣

  理论物理通讯. 1982, 1(6): 680-690.

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  The structure of the mixed state of a current-carrying thin film of ideal type II superconductors in longitudinal magnetic field is analysed. It is shown "that the lossless current flow through the films in the mixed state is possible only if H_e is larger than H_c1 (d).The curves of Longitudinal critical current obtained have complex structures and show the peak effect general.The main features of the theoretical I_c-H_e curve of the films with thickness d larger than 5λ are identical with those observed by Heaton and Rose-Innes in Nb₅₅Ta₄₅ alloys.
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  FLEXOELECTRIC CONSTANTS OF LIQUID CRYSTALS

  林磊

  理论物理通讯. 1982, 1(6): 691-697.

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  The elastic energy density of Iiquid crystal under the action of external electric field E is given by F=F(n_i,n_i,j,E_i,E_i,j……)where n is the director and n_i,j,,E_i,j the gradients. By a systematic expansion of F in polynomials and the use of material symmetries, we obtain macroscopically for nematics and cholesterics all the possible external field-effects. In addition to the well-known dielectric interaction (n · n)and the flexoelec-tric effects of Meyer,-e₁(E · n)(∇ · n)-e₃ E · (n ∇ ·)n,we find a new term e₀n · (n · ∇)E which corresponds to the flexoelectric effect related to electric quadrupoles introduced microscopically by related to electric quadrupoles introduced microscopically by Prost and Marcerou, This new term is not equivalent to the previous two terms of Meyer. An experiment to measure this new flexoelectric constant eo is proposed. Previous experiments measuring fIexoelectric constants are compared and discussed in the light of our theory, which also applies to other cases of external vector fields.
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  STUDY OF πNN VERTEX FROM HADRON AND QUARK POINT OF VIEW

  萨本豪, 张孝泽, 何汉新, 卓益忠

  理论物理通讯. 1982, 1(6): 699-704.

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  we have identified the first-order mixing amplitude of πNN process described by the hadron model with the second-order mixing amplitude of the same process described by the quark model.Then the expression for the coupling constant f_π of the πNN vertex with different quark wave functions and gluon propagators in different approximations has been derived. The calculation results of f_π have been compared with experimental data.
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  THE COMPOSITE PARTICLE REPRESENTATION THEORY: (I) The Composite Particle Representation Transformation

  吴成礼, 冯达旋

  理论物理通讯. 1982, 1(6): 705-724.

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  A generalization of the quantum mechanical representation transformation is presented, in this paper. It is shown that, as an important example, the Boson-expansion method, commonly employed in nuclear physics, corresponds to such a .generalized transformation. Using this generalization, we were able to construct a special representation called the "Composite Particle Representation". In the composite. particle representation, the composite particle degrees of freedom are included, as well as the original particle degrees of freedom. The former is introduced in order that the motion of certain particle clusters can be described as separate entities in a many-body system. This representation is shown to be exactly equivalent to the usual quantum mechanical .representation which .includes only the original particle degrees of freedom. Many applications of this theory are expected, in particular in the study of hadrons.from the quark point of view and the Interacting Boson Mode1 in nuclei.
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  ON THE DYNAMICAL PROBLEMS AND THE FERMION SPECTRA IN THE RISHON MODEL

  周光召, 戴元本

  理论物理通讯. 1982, 1(6): 725-730.

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  we propose to introduce a strong coupling U(1)_丫 axial gauge boson into the rishon model which may explain dynamical problems concerning preservation of chiral symmetries and exist once of solutions to anomaly conditions. Mechanisms through which exotic particles gain masses are discussed. It is found that exotic particles such as color octet Leptons and color sextet quarks may gain masses ranging from 10¹ to 10³. Some phenomenological aspects of these exotic particles are discupsed.
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  TIME CONTINUATION ThEORY IN PATH INTEGRAL QUANTIZATION

  阮图南, 范洪义, 王明中

  理论物理通讯. 1982, 1(6): 731-743.

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  We present the concept of time continuation to develop the path integral quantization given in Refs.[l-2] into a continuing time theory, which can deal with the Minkowski and the Euclidean formulation of path integral quantization in a unified description, and give the general effective Lagrangian and the damping factor for functional integral. In particular, the damping factors in the Feynnlan and the Lee-Yang cases in the Minkowski space are proved to be the positive definite Hamiltonian. But in the Euclidean space, it is the effective Lagrangian which is equivalent to the Hamiltonian and no damping factor is needed. So the Euclidean formulation is advantageous mathematically. It has been mentioned that when Hamiltonian involves a high order of momentum P, there will appear singular term in the effective Lagrangian.
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  THE PROBLEM OF MOTION IN THE KALUZA THEORY

  吴可, 郭汉英

  理论物理通讯. 1982, 1(6): 745-751.

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  It is shown that the equations of motion for a charged massive particle are consequences of the field equations in Kaluza unification theory of gravitation and electromagnetism, i.e., the equations of motion for the particle can be deduced from Kaluza field equations, just as that in Einstein's theory of motion of general relativity the equations of motion for a massive particle are consequences of the Einstein equations. Furthermore, the Lorentz equations for a particle maving in the Maxwell electromagnetic field on the Minkowskian space-time can also be obtained from the Maxwell equations by means of the Kaluze mechanism of the Maxwell theory.
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  ANOMALOUS WEAK CHARGED CURRENTS OF LEPTONS AND QUARKS IN A SUBSTRUCTURE MODEL

  黄涛, 谢诒成

  理论物理通讯. 1982, 1(6): 753-759.

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  We present a general approach to get the anomalous weak charged current of leptons and quarks in a substructure mode1,in which quarks, leptons and W-bosons are composed of preons (fermions and scalar bosons). We have shown that the (V+A) current can be determined by the structure of leptons and quarks and the anomalous weak current can be very small. In particular, it can approach zero, if the wave function of leptons (or quarks) has aspinor structure (I-P/m_f)F.
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  BARYONIUM^[1] AND POSSIBLE SUPERSYMMETRY BETWEEN QUARKS AND ANTIDIQUARKS^[2]

  高崇寿, 何祚庥

  理论物理通讯. 1982, 1(6): 761-767.

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  The possibility that diquark is a stable object in hadrons and there exists a global supersymmetry between quarks and antidiquarks is discussed. Mesons, baryons and baryoniums can be classified unitedly in the adjoint representation of the super-symmetry group. The united mass splitting formula is obtained based on the snpersymmetry and a naive physical mechanism for symmetry breaking. The mass spectra for baryonium ground states are obtained numerically and may be verified experimentally, Some significant characteristics of baryoniums are discussed and can be used as evident indications of the appearance of加ryoniums.
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  CALCULATION OF THE NUCLEAR FISSION BY NUMERICAL SOLUTION OF F-P EQUATION

  吴锡真, 卓益忠, 张锡真, 杨应辉, 马中玉, 冯仁发

  理论物理通讯. 1982, 1(6): 769-778.

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  In this paper, the two-dimensional Fokker-Planck Equation is exactly solved by means of the numerical method. The velocity distribution at the saddle point, the second moments of the coordinate and velocity, and the time development of the nuclear fis-sion rate are studied. The maximum fission rate at a certain viscosity is exhibited by studying the dependence of the fission rate on the nuclear viscosity.
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  RING APPROXIMATION FOR A SYSTEM WITH S-D INTERACTION

  刘福绥

  理论物理通讯. 1982, 1(6): 779-781.

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  The ring approximation for a system with s-d interaction is studied by the Abrikosovfs pseudofermion method. It is shown that the RKKY interaction should be included in the expression of the thermodynamic potential. .Some implications are noted.
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  A PHENOMENOLOGICAL TRANSITION POTENTIAL V_q→qqq DERIVED FROM QCD THEORY

  张宗烨, 余友文

  理论物理通讯. 1982, 1(6): 783-786.

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  The procedure of the derivation of one gluon exchange quarkquark potential is extended from the case of on shell to that of off shell. A phenomenological transition potential between valence quark and sea quark V_q→qqq is obtained.
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  PROLONGATION STRUCTURE APPROACH TO THE GROUP-THEORETICAL TECHNIQUE FOR GENERATING STATIONARY AXISYMMETRIC SPACE-TIMES

  郭汉英, 吴可, 向延育, 王世坤

  理论物理通讯. 1982, 1(6): 787-791.

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  The group-theoreti cal technique for generating stationary axisymmetric gravitational fields is approached by means of the prolongation structure theory for soliton systems. An sp(2)xc(t) structure is obtained via solving the fundamental equation for prolongation structures and the F-equation for Kinnersley-Chitre's generating function is naturally introduced as an inverse scattering equation. A homogeneous Hilbert problem(HRP) associated with the Geroch group K and a corresponding linear singular integral equation are derived based upon a general condition satisfied by the auto-Bäcklund transformations in the sense of prolongation structure theory.
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  EFFECTIVE POTENTIAL DESCRIPTION AND LONG WAVELENGTH STRUCTURE OF THREE-POINT CORRELATIONS I N STRONGLY COUPLED PLASMAS

  Kenneth I. Golden

  理论物理通讯. 1982, 1(6): 793-796.

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  The author analyzes the effective potential of a strongly coupled one-component plasma and shows that beyond a critical value y_c～10 of the plasma parameter, the liquid state is characterized by the predominance of attraction between like charges as mediated by the medium. A new exact long wavelength expression is derived for the three-point structure function.