1988年, 第9卷, 第2期　
刊出日期：1988-03-15

  

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  PHASE TRANSITION ON HIERARCHICAL LATTICES WITH ADDITIONAL DILUTED BONDS

  唐坤发, 胡嘉桢

  理论物理通讯. 1988, 9(2): 127-130.

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  The critical phenomena on hierarchical lattice with additional diluted bonds are investigated for both thermal and geometrical Phase transitions. It is shown that the diluted bonds reinforce the phase transitions but do not change the critical exponents except that they are fully occupied.
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  GROUP ANALYSIS OF SYSTEM EQUATIONS, SYMMETRY REACTION-DIFFUSION BRUSSELATOR

  刘旗超, 方福康

  理论物理通讯. 1988, 9(2): 131-140.

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  General formulas of group classification of the system of nonlinear reaction-diffusion equations(SNRDE) with two unknown functions and four independent variables are given. Group classifying equations of the traveling wave system of-equations corresponding to SNRDE are also obtained.When these results are applied to analyzing Brusselator, we dis-covered that the system of differential equations describing it has only invariant group of spacetime translation.
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  SYMBOLIC DYNAMICS FOR ONE-DIMENSIONAL MAPPINGS WITH MULTIPLE CRITICAL POINTS

  曾婉贞, 丁明洲, 李家男

  理论物理通讯. 1988, 9(2): 141-152.

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  Using two simple models we constructed complete universal periodic sequences for two families of one-dimensional mappings with multiple critical points.
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  STUDIES OF P-MESCN DECAY BY THE TRANSITION POTENTIAL V_q-qqq OF A QUARK-ANTIQUARK PAIR CREATIOR MODEL

  余友文, 邹渝

  理论物理通讯. 1988, 9(2): 153-159.

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  Decay rate of p-meson into two n-mesons was calculated by using the transition potential of a quark-antiguark pair creation model.The theoretical result is in good agreement with the experimental data .Also, the difference of decay widths for processes ρ^±π^±π⁰ and ρ⁰π⁺π^- was discussed.
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  THERMOSTATIC PROPERTIES OF ASYMMETRIC NUCLEAR MATTER AT LOW TEMPERATURE

  王正行

  理论物理通讯. 1988, 9(2): 161-171.

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  The Küpper, Wegmnn, and Hilf's theory on the thermostatic properties of symmetric nuclear matter is extended to the asymmetric nuclear matter at low temperature less than 10 MeV. The numerical result shows that the entropy per nucleon s depends on the asymmetry δ weakly while the compressibility coefficient K depends on δ very strongly. At the neutron drip point the nucleon density n decreases while the asym-, metry ^δND increases linearly with T² at low temperature. The thermodynamic stability of the asymmetric nuclear matter is studied by means of the Gibbs-Duhem inequality.
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  THE EXOTIC FERMIONS FROM COMPOSITE MODES AND THEIR ONIUMS

  张肇西, 周邦融

  理论物理通讯. 1988, 9(2): 173-188.

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  The exotic fermions occurred in some composite models (such as the SLTF(2) family gauged composite model)and their oniums are examined systematically in this papez.It is emphasized that coloured oniums as well as colourless ones may be formed, if their constituents are coloured in high-dimensional representations. According to a rough estimate, the exotic fermions and their oniums should have masses of the order of 0.1 to 1 Tev, hence they may play some. roles in the events at energies of SPPS and/or the next generation colliders, if they do exist.
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  COMPOSITE QUARK MASS HIERARCHY AND FCNC SUPPRESSION

  周邦融, 张肇西

  理论物理通讯. 1988, 9(2): 189-225.

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  The observed quark mass hierarchy and the realistic mixing matrix of quark charged currents may be explained in a framework of a three-fermion composite model, if the quark masses are generated by the condensaties of exotic colored fermions and in the dynamical mechanism, we incorporate the following conjecture that the four-preon hypercolor condensates, which are used to realize the spontaneous breaking of the family gauge group su^F(2) in the model, may correspond to two different mass scales. We also show that all the FCNC including the |ΔS|=2 effective coupling in the model can be suppressed down to below the experimental limit.
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  A REGULARIZATION SCHEME FOR OBTAINING BARDEEN ANOMALY

  阮图南, 井思聪, 范洪义

  理论物理通讯. 1988, 9(2): 227-234.

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  A new regularization operator, (e^{-Ø_L(X)Ø_R(X)/M2}+e^{-Ø_R(X)Ø_L(X)/M2})|_M→∞’ is proposed to calculate the variation of the fermion path-in-tegral measure under a chiral transformation, and the normal anomaly, i.e.Bardeen anomaly, is obtained .in this paper. Moreover, the non-Abelian anomaly of the cosec pure gauge fields is calcula-ted by means of this regularization operator.The corresponding results in Minkowski space can readily be obtained in the principal value integral.
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  THE WAVE FRONT SOLUTIONS OF A REACTION-DIFFUSION SYSTEM WITH NONLINEAR DIFFUSING TERM

  漆安慎

  理论物理通讯. 1988, 9(2): 235-244.

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  The wave front solutions of a Fisher-like equation with highly nonlinear diffusion is studied. The linear stability of the waves is investigated by employing Galerkin Procedure. The global stability. problem is also investigated by numerical simulations. The results demonstrate that the waves possess some special characteristic features, which are different from those of semiLinear Fisher equation.
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  PROOF OF A THEOREM ON DENSITY FUNCTIONAL THEORY

  王文国

  理论物理通讯. 1988, 9(2): 245-246.

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  In this paper we proved for the first time a theorem which has great importance in the density functional theory.
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  MULTIPOLE RANDOM PHASE APPROXIMATION FOR THREE PARTICLE NUCLEAR POTENTIAL

  Saifuddin

  理论物理通讯. 1988, 9(2): 247-251.

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  Using the linearization or random phase approximation the particle-hole excitation amplitude for the rnultipole are calculated.