1988年, 第9卷, 第1期　
刊出日期：1988-01-30

  

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  PLASMON MODES IN SEMI.CONDUCTOR SUPERLATTICES

  杨瑞青, 蔡建华

  理论物理通讯. 1988, 9(1): 1-8.

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  Plasmon and magneto-plasmon modes in semiconductor superlattices are discussed on the basis of a consistent evaluation of the electron polarizability. Dispersion relations showing dimensional crossovers with changes in the modulation wave1ength are obtained.
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  THE IMPROVED MURNAGHAN EQUATION

  马东平, 郑希特, 章正刚, 徐益荪, 李谷波

  理论物理通讯. 1988, 9(1): 9-22.

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  The improved Murnaghan equation is derived by integrating B(P)=-v(∂p/∂v)_T=B₀⁽¹⁾(P)·P and expanding B⁽¹⁾(P) and simllar function in series of (1-K) , where K is the compression ratio (K≡(v/v₀)^1/3. The new equation obtained is compared with Murnagnan equation, Keane equation and Birch equation.It is found that, the improved Murnaghan equation has better convergency in comparison with the Birch equation. The characteristics of the new equation and the reasons of its better convergency are discussed.
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  DIFFUSION IN ULTRAMETRIC SPACE

  郑强

  理论物理通讯. 1988, 9(1): 23-31.

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  We presented an exact solution to the diffusion in a non-uniform multifurcating ultrametric space. We found a different critical behavior of relaxation with temperature from before. We proved that the detailed multifurcating structure of an ultrametric space has a weak influence on the long-time behavior of relaxation.
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  ON THE CALCULATION OF THE MATRIX ELEMENTS IN THE HYPERSPHERICAL HARMONIC METHOD FOP _∧∧⁶He AND _∧⁹Be

  姜国荣, 金星南

  理论物理通讯. 1988, 9(1): 33-39.

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  In this paper, the detailed description of the mathematical method of using the adiabatic approach to the hyperspherical harmonic method to calculate the ground states of hypernuclei _∧∧⁶He and _∧⁹Be is given.
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  ONE BOSON EXCHANGE N-N, N-Δ AND Δ-Δ INTERACTION FROM QUARK POTENTIAL MODEL

  陆志成, 余友文

  理论物理通讯. 1988, 9(1): 41-49.

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  The equivalent one-boson-exchange potentials of the N-N, N-Δ and Δ-Δ interaction were calculated rigorously in momentum space with the vertex functions derived from quark-pair-creation model.The results of the N-N interaction were compared with those calculated approximately in coordinate space and the conventional one-boson-exchange potentials. A11 of the results indicate that they have very similar behaviour for the medium- and Long-range parts.
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  GLUON CLUSTER IN NUCLEI AND EMC EFFECT

  朱伟, 沈建国

  理论物理通讯. 1988, 9(1): 51-61.

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  The gluebond and its ro1} in the EMC offect are proposed in this paper.The discrepancy between electro and muon-production data can be ascribed to the QCD evolution of the gluebond in nuclei.The enhancement of the gluon distribution at small x, observed in J/Ψ muon-production experiment，can be also explained by using the gluebond model.
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  RELATIVISTIC EQUAL-TIME EQUATION OF BOSE-FERMI SYSTEM

  陈琳, 阮图南

  理论物理通讯. 1988, 9(1): 63-73.

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  The relativistic equal-time equation of Bose-Fermi system and its conjugate equation are found.The hermiticity of equal-time potential and equal-time scattering amplitude is discussed. The result shows that if the Feynman Green function is replaced by the retarded Green function, the hermiticity of equal-time potential and equal-time-scattering am-plitude will be confirmed.
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  THE FOKKER-PLANCK EQUATiON AND THE SCHWI NGER-DYSON EQUATION IN LATTICE GAUGE THEORY

  薛社生

  理论物理通讯. 1988, 9(1): 75-88.

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  The stochastic quantization in Lattice Gauge Theory (LGT) is discussed by using Langevin equations and Fokker-Planck equations. It is shown that the evolution equation in stochastic process reduces to Schwinger-Dyson equation when lattice system reaches equilibrium.
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  THE ΔS=l WEAK RADIATIVE DECAYS OF HYPERONS

  李学潜

  理论物理通讯. 1988, 9(1): 89-108.

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  We calculate the rates and asymmetry parameters of radiative hyperon decays based on the hybrid structure of hyperons.We exploit an effective Hamiltonian derived from a penguin-Like Feynman diagram. We also consider a model of a static mean gluon field. A plausible recoil effect is taken into account in the final results. The resultant asymmetry parameters are reasonably consistent with data.
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  THE POSSIBLE ORIGIN OF STRCNG MAGNETIC FIELD OF NEUTRON STAR:FERROMAGNETIC STATE

  王琴妹, 高尚惠

  理论物理通讯. 1988, 9(1): 109-117.

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  The magnetic susceptibility of neutron matter was calculated by means of Owen's LOCV method. The results showed that a transition to a ferromagnetic state can exist for HJ, IY and M-S potentials, but there is no transition for Reid soft-core potential .By analyses, we concluded that the ferromagnetic state is a possible origin of strong magnetic field within the neutron star. We also considered an influence of the ferromagnetic state on the mass, radius and moment of inertia of the neutron star.Finally we discussed the effect of magnetization on physical state in the neutron star.
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  NULL GEODESIC EQUATION EQUIVALENT TO THE GEOMETRIC OPTICS EQUATION

  吴雪君, 须重明

  理论物理通讯. 1988, 9(1): 119-125.

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  In this paper, we proved that the null geodesic equations in general isotropic metric are rigorously equivalent to the differential equations bf light rays in a medium of flat 3-dimension.,31 space, which are the fundamental equations of geometrical optics, when the effect bf gravitational field tb light ray is taken as that of a variable "refractive index"。Our results provide the basic way to strictly describe the characteristics of some gravitational fields in terms of the Euclidean framework. It may be useful in the computation of modern astrometry and gravitational Lens effects. Finally, as a special example，the deflection of Iight by gravitational field is discussed by means of the formula of pure classical geometrical optics.