1985年, 第4卷, 第6期　
刊出日期：1985-11-30

  

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  A SEMI-MICROSCOPIC MODEL FOR ACOUSTICAL ACTIVITY

  梅长江, 郝柏林

  理论物理通讯. 1985, 4(6): 795-802.

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  In this paper we suggest a semi-microscopic model to describe the phenomenon of acoustical activity and to extend the point group symmetry consideration first given by Portigal and Burstein[1].
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  THEORY OF RAMAN SCATTERING FROM CHARGE DENSITY-WAVE SUPERCONDUCTORS

  雷啸霖, Joseph L. Birman, 丁秦生

  理论物理通讯. 1985, 4(6): 803-826.

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  A theory is developed for the Raman scattering of light from a charge-density-wave (CDW) superconductor on the basis of a modified Balseiro-Falicov interactibn pro.posed by the authors and including renormalization of both the Coulomb interaction at the small q limit, and the residual coupling between electrons. Both the electron-photon and electron-phonon vertices are taken into account. It is shown that there always exist poles at frequency ω=2Δ (Δ is superconducting gap) in the effective electron polarization and in the phonon self-energy, and these poles survive the Coulomb screening and the renormalization of the residual electron interactions if the coupling parameter g₂(k) is anisotropic, in contrast with an isotropic electron gas. The effect of the Littlewood-Varma interaction in a coexistent CDW-siiperconductcr is also discussed.
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  EXTENDED TIME-DEPENDENT HARTREE-FOCK APPROXIPIATION AND DISSIPATIVE DIABATIC DYNAMIC

  王顺金

  理论物理通讯. 1985, 4(6): 827-845.

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  The extended time-dependent Hartree-Fock approximation (ETDHF) is derived In a new approach in whlch the equations of nation for many-body correlation matrices are given up to the second order. The eigen representation of the ETDHF is established and compared with other representations. A possible parametrization of the ETDHF js presented in the limit of low collective velocity and the diabatic shell model single particle bases are discussed from the viewpoint of the parametrized ETDHF. The dissipative diabatic dynamics(DDD) is derived from the ETDHF and it 1s proved to be a realization of the ETDHF in the time-dependent shell model representation. The formal solutions of the occupation number n_α(t) are given in reasonable approximations and they are proved to bear the basic features of the DDD. Filially the decaying diabatic potential proposed phenomenologically in DDD is derlved microscopically.
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  NONDIFFRACTIVE HADRON-HADRON COLLISIONS AT EXTREME EMERGIES

  蔡(日助), 刘连寿, 孟大中

  理论物理通讯. 1985, 4(6): 847-851.

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  Based on a statistical model which successfully describes the data in energy interval √s=14 GeV to √s=540 GeV, predictions for multiplicity and rapidity distributions at √s=900 GeV, 2TeV and 40 TeV are made.
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  REISSNER-NORDSTROM BLACK-HOLE AND BOSON BOUND STATES

  张瑞明, 李元杰

  理论物理通讯. 1985, 4(6): 853-860.

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  The Klein-Cordon equation in Reissner-Nordstrom metric is discussed. First, we reduce the equation in Reissner-Nordstrom metric to canonical form. Then, using spectroscopic eigenvalue analysis method it is found that bosons cannot be attracted by Reissner-Nordstiom black hole to form bound states.
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  PATH INTEGRAL OF SYMMETRY SYSTEN WITH CONSTRAINTS

  马千乘, 阮图南

  理论物理通讯. 1985, 4(6): 861-867.

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  When the constraints of a system. form a functional. group the path integral quantum amplitude can exactly be obtained.It can be shown that the constraints deduced by symmetryjust just form the functional group. Most of the interesting systems in physics are such symmetry systems.
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  THE TOTAL DERIVATIVE OPERATOR AND ITS INFLUENCE OVER THE QCD SUM RULES FOR BARYON MASS

  刘觉平

  理论物理通讯. 1985, 4(6): 869-882.

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  We investigate two-point function of baryon operator including the total derivative operator. The upper bounds of baryon mass are improved by introducing the total derivative operator, and we explained further the reason why the improvemenfs for the mass bounds are obtained by means of the zero width approximation. The analysis for baryon A(1405) is made.
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  RELBTIVISTIC CORRECTJON TO NEUTRON'S STAT1 STICS UNDER A UNIFORR MAGNETIC FIELD (I)—AT ZERO TEMPERATURE

  孙宗扬, 张永德, 尹鸿钧, 阮图南

  理论物理通讯. 1985, 4(6): 883-891.

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  The relations between magnetic moment of neutron's system and intensity pf outer uniform magnetic field are obtained by Mellin transforms with which the grand partition function of the system can be evaluated. In this expr&sion a constituont trem is referred to the relativistic effect and the remaining term is the ordinary one which represents,the magnetic moment of neutron's system descrobed by non-relativistic Pauli equation.And the value H_C of the magnetic intensity undgr which the magnetic moment of the systemtends to saturation is found.
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  RELATIVI STlC CORRECTION TO NEUTRON'S STATISTICS UNDER A UNIFORM MASNETIC FIELD (Ⅱ)-AT A FINITE TEMPERATURE

  张永德, 孙宗扬, 尹鸿钧, 阮图南

  理论物理通讯. 1985, 4(6): 893-904.

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  In this paper the method for evaluating the grand partition function Z_G at a finite temperature is further investigated and a corresponding expression of convergent series for the function lnZ_G is obtained. In the extreme cases both in the neighbourhood of very low and very high temperature, the asymptotic expession of susceptibility and the state equations of matter are derived. The heat capacity with a constant volume is also discussed.
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  THE MIXEFIFNECTG OF Z⁰ AND TOPONIUN

  何祚麻, 刘嘉凌, 张晓峰, 朱重远

  理论物理通讯. 1985, 4(6): 905-909.

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  It is shown that the mixing effect between the Z⁰ and the toponium will significantly affect various properties of toponium state.