1987年, 第7卷, 第3期　
刊出日期：1987-04-30

  

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  THE CORRECTION OF HYDROGEN MOLECULAR EXCITATION TO THE ³T β-SPECTRUM

  赵小麟, 庆承瑞

  理论物理通讯. 1987, 7(3): 195-206.

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  Using a modified variational wave function of Michels type the second excited ¹Σ state of HeH⁺ ionis calculated, and consequently its contribution to the tritium molecule β-spectrum is estimated. Inaddition to this, the source temperature effect as well as the effect of different isotopic compositions such as T₂, TD and TH in the hydrogen molecules are also discussed in detail.
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  SURFACE ELECTRONS IN IONIC CRYSTALS

  顾世洧, 张杰

  理论物理通讯. 1987, 7(3): 207-214.

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  The properties of a surface electron in the ionic crystal are studied. The effective Hamiltonian and the ground state energy of the electron in a phonon field are derived. The two limiting cases of the effective Hamiltonian are discussed. The different meanings represented by the bulk and surface coupling constants for some ionic crystals are analysed.
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  EFFECT OF THE INERTIAL TERM ON THE CDW TRANSPORT PROPERTIES Ⅱ. NUMERICAL SOLUTIONS

  董锦明, 王亚新

  理论物理通讯. 1987, 7(3): 215-233.

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  Using the classical particle model with an inertial term, we have numerically analyzed the effect on the nonlinear transport properties of the CDW system,e.g., the hysteresis effect, the interference phenomena between the dc and ac applied fields. Our calculations demonstrate the importance of the inertial effect on the sliding CDW states. Some results are probably new, and important to experimental observations; for example, the zero step width region exists for the 1/2 subharmonic step in its variation with amplitude of the ac driving field.
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  DIRECT COMPACTIFICATION OF HETEROTIC STRINGS FROM 26 TO 4 DIMENSIONS VIA T²²/G

  蓝志成, 李大西

  理论物理通讯. 1987, 7(3): 235-243.

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  We discuss compactificstion of the heterotic string in a U=T²²/G manifold, where G acts on the 22-dimensional torus T²² without fixed points. This non-trivial mixture of the internal 16-dimensional space enables chiral theories to exist in U. In a11 the three examples which we discuss in detail,the symmetry groups after compactification are all equal to E₆×SU(3)×E₈', though the imbeddings of these groups in E₆×E₈' are different for different cases. The resulting numbers of massless chiral fermion multiplets are a1so different.
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  STRING THEORY WITH THREE FAMILIES OF CHIRAL FERMIONS

  李大西

  理论物理通讯. 1987, 7(3): 245-252.

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  A heterotic string theory is constructed by compactifying directly from 26 to 4 dimensions via a smooth manifold T²²/G. In the low energy limit, there are three families of chiral fermions with exactly the same quantum numbers as thatin the standard supersymmetric SU(3)×SU(2)×XU(1) model. They couple to supergravity and supergauge fields with the gauge symmetry SU(3)_F×SU(3)_c×SU(3)_L×U(1)_YR×U(1)_I3R.
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  THE ANALYTICAL RESULT OF THE EFFECT OF THE VIRTUAL QUARK LOOPS TO SU(2) AVERAGE PLAQUETTE ENERGY

  吴济民, 赵佩英

  理论物理通讯. 1987, 7(3): 253-261.

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  By using hopping parameter expansion and cumulant expansion, as an example, we calculate analytically the effect of fermion determinant to average plaquette energy < E_p > up to k⁶ order. The corrections of the fermion determinant to < E_p > are controllable small in our approximation.
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  THE IMPROVED HAM1 LTONI AN AND ρ-ω MASS DIFFERENCE IN LATTICE GAUGE THEORY⁺

  郭硕鸿, 陈启洲, 刘金明

  理论物理通讯. 1987, 7(3): 263-273.

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  We formulate a Hamiltonian theory on the lattice including next-to-nearest neighbor fermion interactions. A canonical transformation is made to induce a momentum-dependent mass term. The meson spectrum is studied by using this Hamiltonian. The current algebra formula for the pion mass is derived. The ρ-ω mass ratio in the intermediate coupling region is in agreement with the experimental value.
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  RESCALING FOR KAON STRUCTURE FUNCTION

  朱伟, 沈建国, 邱锡钧

  理论物理通讯. 1987, 7(3): 275-279.

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  We use the valon model to analyse the dynamical rescaling of x in the inelastic structure functions and point out that the rescaling is just the delta approximation of the valon distribution functions. We apply the contribution of valence quarks to the mass of a hadron bound state to determine a few parameters for the x-rescaling and thus obtain the Kaon structure functions. The result is in good agreement with experimental data.
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  MONTE CARL0 SIMULATION OF SU(3) SINE ACTION USING DISCRETE SUBGROUP*

  李文铸, 张剑波, 董绍静

  理论物理通讯. 1987, 7(3): 281-285.

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  Using subgroup of SU(3). we perform the Monte Carlo simulation of sine action in the 4-dimensional square lattice, and find that, for the largest crystal-like subgroup S(1080). the freezing transition point is at β=3.80. This value is larger than that of the Wilson actior. This indicates that by selecting an adequate lattice action, it is possible to substitute the discrete subgroup of SU(3) successfully for SU(3) group itself in Monte Carlo simulation.
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  DISCUSSIONS ON THE GENERAL SOLUTIONS TO THE WESS-ZUMINO CONDITIONS IN HIGHER DIMENSIONS

  金安君, 熊传胜, 朱重远

  理论物理通讯. 1987, 7(3): 287-291.

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  The general solutions to the Wess-Zumino(wZ) conditions in higher even dimensions are given. For odd dimensional cases we find no nontrivial solutions.