1986年, 第5卷, 第1期　
刊出日期：1986-01-30

  

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  DISPERSIVE DIFFUSION INDUCED BY INFRARED DIVERGEPICE (IRD)

  邓辉舫, 刘福绥

  理论物理通讯. 1986, 5(1): 1-18.

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  In this paper, based on a new form of the hopping timedisrribution function ψ(t) in infrared divergence theory,the iteration expansions and asymptot.ic expansions for themcan-squared displacement and the dispersive diffusioncoefficient are obtained. A1l the results contain a singleparametern, i.e., the infrared divergence expnent whichcharacterizes dispersion. In comparison with other theories,the present theory is of more general interest and is in agreement with exoeriments much better and nearly perfectly.
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  EXACT RESULTS ON THE ANISOTROPIC BOND-DILUTED POTTS MODEL

  林滨, 杨展如

  理论物理通讯. 1986, 5(1): 19-30.

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  We propose a new Potts model, anisotropic bond-dilutedPotts model on square lattice. The interactions along x and y directions in this model are generally unequal and the bond-odcupied probabilities in two directions are also assumed to be different. Such a model is a general Potts model on the square lattice. By establishing the equivalence between anisotropic bond-diluted model and anisotropic regular model and making use of the exact critical relations of regular model, we obtain the critical conditions for anisotropic bond-diluted Potts models with ferromagnetic and antiferromagnetic interactions. Phase diagrams according to these conditions are presented numerically with q=1,2,3,4,5,6 (ferr. case) and q=1,1.5,2,2.5 (antiferr. case) and a discussion about these diagrams is carried out.
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  THE COMPOSITE PARTICLE REPRESENTATION CALCULATIONS FOR ODD FERMION SYSTEM

  王爱莲, 王克协, 回瑞发, 吴承勳, 吴成礼

  理论物理通讯. 1986, 5(1): 31-53.

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  Using the Composite Particle Representation (CPR)method, the spectrum and wavefunction of ⁹¹Nb, ¹⁹O and ¹⁹F are calculated and compared with the shell model results.It shows that the CPR method is exactly equivalent to the shell model calculation in the conventional representation.
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  LOCAL SYMMETRY AND CONSERVED CURRENTS OF PRINCIPAL CHIRAL MODEL WITH TOPOLOGICAL TERM

  侯伯宇, 王育邠

  理论物理通讯. 1986, 5(1): 55-66.

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  In this paper we show the scattering problem's equation of principal chiral model with Wess-Zumino-Witten term.Two sets of symmetry transforms are given and four series of conserved currents are obtained, in which two of them are Noether types and the others are not. Finally the Kac-Moody algebra is discussed.
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  THEORETICAL INVESTIGATION OF THE ISOSPIN VIOLATING HADRONIC TRANSITIONS Ψ'→Ψ(1¹P₁)+π° AND T"→T(1¹P₁)+π°

  马坚, 邝宇平

  理论物理通讯. 1986, 5(1): 67-78.

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  The isospin violating processes Ψ'→Ψ(1¹P₁)+π° and T"→T(1¹P₁)+π° are investigated in the framework of the multipole expansion in quantum chromodynamics. Using the rate of Ψ'→Ψ+π° as an input to determine the isospin violating vertex, we obtain the following branching ratios for the processes BR(Ψ'→Ψ(1¹P₁)+π°)～10^-6-10^-5, BR(T"→T(1¹P₁)+π°)～10^-5-10^-3 for M₁1_p1=1/9(5M₁3_p2+3M₁3_p1+M₁3_p0). These are too small to be detected in the present experiments.
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  COUPLED CHANNEL EFFECT IN HADRONlC TRANSITIONS IN HEAVY QQ SYSTEMS

  李国忠, 邝宇平

  理论物理通讯. 1986, 5(1): 79-88.

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  Coupled channel effect in hadronic transitions in the cc and bb systems is studied based on the unitarized quark model and the quark pair creation model.It is shown that the effect is significant and the hadronic transition rates in the bb system are enhanced relative to those in the cc system.
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  A NOTE ON INDEX THEOREM AND GENERALIZED SECONDARY CLASSES

  郭汉英, 吴可, 王世坤

  理论物理通讯. 1986, 5(1): 89-93.

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  It is shown that the integral of the k-th generalized secondary characteristic class,Q_n^(k) over a manifold M^2n-k on which it is defined could be expressed as the. one of an n-rank characteristic polynomial in the curvature of the interpolation connection over M^2n-kXΔ^k where A^k is a ksimplex.And consequently the polynomial Q_n^(k), say k=2,would be related to the analytic index of a certain elliptic operator on M^2n-k by means of the Atiyah-Patodi-Singer index theorem on M^2n-kXΔ^k and the adiabatic approximation.
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  GENERALIZED GAUGE TRANSFORMATION AND CHERN SIMONS COCHAIN

  周光召, 吴岳良, 谢彦波

  理论物理通讯. 1986, 5(1): 95-98.

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  A gauge potential defined on group manifold is defined to qeneralize the gauge transformation.Some symmetry properties and a generalized Chern-Simons cochain are formed.