1987年, 第7卷, 第2期　
刊出日期：1987-03-15

  

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  STUDY OF ELECTRONIC SPECTRA IN INHOMOGENEOUS DISORDERED CHAINS BY RENORMALIZATION-GROUP BLOCK-DECIMATION METHOD

  谭明秋, 熊诗杰

  理论物理通讯. 1987, 7(2): 97-104.

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  we have generalized the renormalization-group block-decimation method to study the spectra of the inhomogeneous disordered binary alloy chains. The numerical results for the densities of states in periodically modulated disordered chains are obtained.
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  NUCLEON PROPERTIES IN A QUARK BAG MODEL WITH WOODS-SAXON TYPE CONFINING POTENTIAL

  王英才, 马维兴, 何汉新

  理论物理通讯. 1987, 7(2): 105-115.

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  A quark bag model with Woods-Saxon type confining potential is suggested. This model is used to examine three well-nown characteristic quantities of the nucleon and the proton electromagnetic form factors are evaluated by considering the quark core contributions. It is found that our model employing a confinement of W-S potential can improve the fit with the experimental values and can give good results for the form factors.
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  THE FACTORS FOR THE EMC PHENOMEKON AND THE RATIO R^A=(σ_L/σ_T)_A

  张肇西, 赵维勤

  理论物理通讯. 1987, 7(2): 117-124.

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  The three factors are discussed which may be related to the EMC phenomenon directly, and it is tried to understand the new results on the ratio R^A=(σ_L/σ_T)_A. It is also pointed out that shadowing cannot match the obvious deviation in the small x region between the data obtained by the two categories of experiments PA and eA.
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  NORNAL PRODUCT EXPANSION OF ROTATION OPERATORS GAINED BY COHERENT STATE METHOD

  范洪义

  理论物理通讯. 1987, 7(2): 125-135.

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  In Schwinger boson representation of angular momentum theory we derive new normal product expansion of rotation operators which can generate new operator identities in the Hilbert space to which SU₂ group maps, some properties and applications of them are presented.
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  RIEMANN-HILBERT PROBLEM OF THE QUANTUM NONLINEAR SCHRÖDINGER MODEL

  陈宇综

  理论物理通讯. 1987, 7(2): 137-147.

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  In this paper we present a representation of quantum Riemann-Hilbert problem of the nonlinear Schrödinger model, from which both the results of direct problem of the quantum inverse scattering method and the quantum Gelfand-Levitan equation can be given. It is pointed out that this method may be extended to any other quantum AKNS-type model.
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  COMPOSITE PARTICLE REPRESENTATION METHOD FOR BARYON SPECTRUM

  朱耀银, 王秀江, 赵玄, 曾繁安, 侯仁昌, 巫光汉, 滕礼坚, 余超凡, 和音, 王凡

  理论物理通讯. 1987, 7(2): 149-164.

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  In this paper, the baryon is regarded as a two-body system which consists of a diquark and a quark. The baryon spectrum is calculated by means of the composite particle represenEation based on the nonrelativistic potential model.The effectfve quark potential is determined by fitting the meson spectrum. Therefore, there is only one adjustable parameter in the calculations, and that is the harmonic oscillator frequency. ω in the single-quark basis. The theoretical results are reasonably consistent with the experimental data.
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  DYNKIN'S EMBEDDING METHOD AND SUBALGEBRA CHAINS OF U(6)⊃SU(3)^*

  凌寅生

  理论物理通讯. 1987, 7(2): 165-173.

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  Use Dynkin's embedding method to find out the generators of two subalgebra chains of U(6)⊃SU(3).
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  WAVE FUNCTIOM OF THE UNIVERSE WITH QUAETUM CORRECTION OF MATTER FIELDS

  李淼, 冯珑珑

  理论物理通讯. 1987, 7(2): 175-185.

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  Considering the effective gravitational actionincluding the quantum correction of the matter fields, we calculate nearly realistic wave function of the universe by using the scheme of Hartle and Hawking. The particular case with the cosmological constant Λ=0 is discussed, then the conclusion that the spacetime may be de Sitter's without Λ is obtained, this is just a result of interaction between gravity and matter fields. When the radius of the universe is larger than 10^-1lp, the universe must be on the classical epoch. This paper shows that a practical quantum model of the universe is possible.
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  THE OPERATOR METHOD FOR SOLVING THE MOMENT EQUATION OF FOKKER-PLANCK EQUATION

  初福明, 方福康, 姜璐

  理论物理通讯. 1987, 7(2): 187-194.

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  In this paper we study the moment equation of Fokker-Planck equation (FPE) , by using the translation operator and the technique of the exponential operator decomposition. Some results of the relaxation process described by FPE are obtained.