1985年, 第4卷, 第2期　
刊出日期：1985-03-30

  

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  R MODIFIED RECURSION METHOD FOR ONE-DIMENSIONAL POTTS MODEL

  杨展如

  理论物理通讯. 1985, 4(2): 157-162.

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  A modified recursion method is proposed and used to produce the exact result of the partition function for a one-dimensional Potts model with either free boundary or periodic boundary. The method is compared with both transfer matrix method and Marchi and Vila's method. It may perhaps provide a possible way to solve the Potts model on two-dimensional square lattice.
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  ULTRASONIC PROPAGATIONS IN THE COMPOSITIONALLY MODULATED STRUCTURE(CHS)

  邹南之, 龚昌德

  理论物理通讯. 1985, 4(2): 163-171.

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  The dynamic equation of acoustic vibration in a compositional modulated structure(CMS) is obtained under the mean field approximation. The general feature of the sound propagation in CMS is discussed and the corresponding dispersion law, the forbidden bands of the sound waves and their dependence on the moaulating parameter are perfectly determined.
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  ELECTRON STATES IN SIMPLE METALLIC COMPOSITIONALLY MODULATED STRUCTURE

  邹南之, 邢定钰, 龚昌德

  理论物理通讯. 1985, 4(2): 173-179.

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  We present a generalization of the coherent potential approximation (CPA) in order to make it applicable to simple metallic compositionally umdulated structure. The medium Green's function and the coherent potential in the CPA are calculated by using the infinite order perturbation theory and the CPA self-consistent equation.
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  NEW OPERATOR IDENTITIES GAINED VIA COHERENT STATE FORMULATION

  范洪义, 阮图南

  理论物理通讯. 1985, 4(2): 181-194.

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  By the properties of the coherent state and the technique of performing integrations within ordered products as in Ref. [1], we derive some new useful operator ordering identities. Their applications, especially in studying the Boglyubov transformations both in one and two dimensional cases, are presented. The explicit non-unitary operators which turn the coordinate or momentum eigenstate to the corresponding coherent state are also given. Moreover,by using t h e Schwinger angular momentum theory and the technique mentioned above we f!nd the normal product form of the rotation operator, with which the coefficient of the rotation D-matrix can be easily obtained.
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  FITTING THE EMC PHENOMEFJON WITH A MODIFIED SCALE CHANGE MODEL

  张肇西, 赵维勤

  理论物理通讯. 1985, 4(2): 195-207.

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  It is pointed out that when fitting the ENC experiments, as a modified version of the scale change model, two more factors based on theoretical considerations should be taken into account and probably the valence quark component has a different effective confinement scale from that of the sea quarks.
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  SOME DISCUSSIONS OF POSSIBLE MECHANISM OF Z⁰→l⁺l^-γ

  高崇寿, 何柞麻, 叶军

  理论物理通讯. 1985, 4(2): 209-217.

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  The possible mechanisms for anomalous decay Z⁰→l⁺l^-γ are discussed. The mechanism with anomaious ZZ_Y vertex is investipted indetail. It is pointed out that this vertex may appear via some effective Lagrangian which can be derived from an SU(2)×U (1) gauge invariant effective Lagrangian after the spontaneous symmetry breaking. The predictions based on this mechanism are consistent with recent experiments and can be verified experimentally. This mechanism is consistent with a composite model of Z⁰ with radius 10^-15 cm.
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  FINITE TEMPERATURE AXIAL ANOMALY IN EUCLIDEAN SPACE

  赵万云

  理论物理通讯. 1985, 4(2): 218-251.

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  The finite temperature axial anomalies in Euclidean space are studied within the framework of perturbation theory. The axial anomalies are shown to be the same at both T≠0 and T=0.
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  FIULTI-SOLITON IN ONE DIMENSIONAL COUPLED BOSE-FERMI SYSTEM

  杨振青, 郭儒

  理论物理通讯. 1985, 4(2): 253-257.

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  With a model of a modified R⁴ field coupled to a Dirac field we obtain a multi-soliton and Corresponding fermion modes in the presence of the multi-soliton. The fermion number is also discussed.
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  A MODEL NATURALLY INCLUDING BOTH LIGHT MAGNETIC MONOPOLES AND FRACTONS

  李铁忠, 吴丹迪, 陈天崙

  理论物理通讯. 1985, 4(2): 259-263.

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  In this paper we studied the multi-scale symmetry breaking for unification model SO(10)×SO(5) probably including both light monopoles and fractons. It is found that for the given value of Weinberg angle, the mass of monopole is upper-bounded and the relation between the mass of monopole and the coupling constant of SO(5) is obtained.
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  AN INFLATIONARY MODEL OF KALUZA-KLEIN TYPE

  陈时, 俞允强

  理论物理通讯. 1985, 4(2): 265-270.

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  Assuming an equation of state as p₁=ρ/3 and p₂=ρ/D, an inflationary model of Kaluza-Klein type is studied. By solving the horizon and entropy problems, it is found that the dimension of the extra subspace should be as large as 35 to 70, if the ratio of R₂(max) to Planck length is taken as 10² to 10⁴. However, the substantial period of the inflation happens at time much larger than the Planck time if we take the ratio as 10³ or even a larger number.
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  DOES THE RUBAKOV EFFECT EXIST IN AN SU(2) MODEL

  李新洲, 汪克林, 张鉴祖

  理论物理通讯. 1985, 4(2): 271-276.

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  In an SU(2) spontaneously broken gauge theory with a Higgs triplet, the mass effect of an iosspin 1/2 fermion on the fernlion-nlonopole bound states is discussed. It is shown that when the direct coupling betrveen fermion and Higgs field approaches zero, but the Dirac mass remalns finiteness, the necessary condition of the fermion-monopole bound state cannot be satisfied. This result means that the Rubakov effect is absent for SU(2) monopole because of the Dirac mass.
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  THE DONNACHIE-LANDSHOFF MODEL WITH A NON-LINEAR TRAJECTORY AND THE COLLIDER DATA

  Mu jahid Kamran

  理论物理通讯. 1985, 4(2): 277-280.

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  It is pointed out that the Donnachie-Landshoff model does not agree with the collider b-data. A non-linear pomeron trajectory is introduced in the model to remedy this defect.