1984年, 第3卷, 第6期　
刊出日期：1984-11-30

  

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  THE COMINANT TERM POSITIVITY OF TIME-EVOLUTION OPERATOR IN THE PHYSICAL REPRESENTATION

  符洪, 郝柏林

  理论物理通讯. 1984, 3(6): 663-680.

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  In the diagonal subspace of the Liapounov representation introduced by the Brussels group, the dominant terms for any matrix element of th a time evolution operator are given explicitty if the Hamiltonian satisfies some general conditions held in all models studied so far. All these expressions have semi-definite positive forms so that, when they are different from zero for a particular isolated system, the "microscopic entropy" will increase montonically util the sustem approaches the well-known microcanonical equilibrium.
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  THE UNIFIED MODULATE SOLUTION IN THE PRESENCE OF LIFSHITZ TERM

  常树人, 杨振青

  理论物理通讯. 1984, 3(6): 681-686.

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  In this paper a method is developed for obtaining a unified modulate solution in the presence of Lifshitz term or its homologue. The P-IC and IC-C transitions are also discussed.
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  THE VARIATIONAL PRINCIPLE AND THE GENERALIZED VARIATIONAL PRINCIPLE IN MHD FOR AN IDEAL INCOMPRESSIBLE FLUID

  方锦清

  理论物理通讯. 1984, 3(6): 687-696.

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  By means of CNIEN Wei-zang's method, under some conditions, the generalized variational principles in MHD for an ideal incompressible,luid are discussed.
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  THE EFFECT OF PION CONDENSATION IN HIGH ENERGY PROTON-NUCLEUS SCATTERING

  马维兴, 冯正永, 赵叔平

  理论物理通讯. 1984, 3(6): 697-705.

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  According to the prediction made by A.B. Migda, a pion condensate should already be present in ordinary finite nuclei, We have studied the effect of pion condensate in high energy proton-nucleus scattering by using the Glauber multiple scattering theory, A calculation has been performed for P-⁴⁰Ca elastic scattering at the incident energy of 1 GeV and compared with the data available. The results strongly indicate that pion condensate does not have an adequate, opportunity to manifest itself in high energy proton-nucleus scattering, at least so for small angle scattering.
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  ON THE GAUGE INVARIANT WESS-ZUMINO-WITTEN TERM

  张肇西, 郭汉英, 吴可

  理论物理通讯. 1984, 3(6): 707-713.

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  It is shown that a term η/4ξ^μLαβ Tr(F_μL^L UF_αβ^R U^-1) with η being an undetermined imaginary constant is allowed in a general form of the gauge invariant Wess-ZUmino-Witten in the effective Lagrangian theory. And the consequences due to the term are explored, the processes related to the determination of the parameter η are discussed.
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  ELECTRO-WEAK INTERACTIONS IN WESS-ZUMINO-WITTEN EFFECTIVE ACTION

  周咸建

  理论物理通讯. 1984, 3(6): 715-725.

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  When electro-weak interactions are incorporated into Wess-Zumino-Witten effective action, the Cabibbo-like parameters automatically appear in the action. Applications of the action, to weak decays of pseudoscalar mesons are discussed.
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  MOTION OF NEUTRONS IN SLAB-LIKE UNIFORM MAGNETIC FIELDS

  张永德, 吴民, 张泰永, 阎沐霖, 阮图南

  理论物理通讯. 1984, 3(6): 727-744.

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  The rigorous solutions of the relativistic wave equation for neutrons are obtained in the case of slab-like uniform magnetic fields at perpendicular incidence. For all energy rerions (from zero to ultra-relativistic), corresponding expressions of the one-dimensional scattering of neutrons,in particular, neutrons with very slow velocities, are studied. Finally, the corresponding transformations of the neutron's spin vectors are given.
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  A METHOD FOR CALCULATION OF THE MINIMA OF THE POTENTIALS IN SUPERSYMMETRIC SU(N) GRAND UNIFIED THEORIES COUPLED TO N=l SUPERGRAVITY

  东方晓, 杜东生, 薛丕友, 周咸建

  理论物理通讯. 1984, 3(6): 745-756.

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  A systematic method for calculation of the minima of the potential in a simple supersymmetric SU(N) grand unified theory coupled to N=1 supergravity is presented. The method is essentially valid for more complicated cases of such theories.
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  A POSSIBLE INTERPRETATION FOR THE ξ(2.2) OBSERVED IN THE J/ψ RADIATIVE DECAYS

  赵光达

  理论物理通讯. 1984, 3(6): 757-765.

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  We interpret the ξ(2.2) as an orbitally excited (L=2) four quark state qsqs (q=u,d) which would decay into Kk via qq annihilation or rearrangement with a typical width of 0(10 MeV). The possibility of interpreting the θ(1.7) as an S-wave qsqs state is also discussed.
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  ON THE TWO-DIMENSIONAL MON-LINEAR σ MODEL WITH WESS-ZUMINO TERM

  周光召, 戴元本

  理论物理通讯. 1984, 3(6): 767-770.

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  The classical solutions of the two-dimensional non-linear σ model with Wess-Zumino term are shown to be equivalent to that without the Wess-Zumino term under a suitable transformation.
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  GREEN FUNCTION THEORY AND ITS GLOBAL STRUCTURE

  戴显熹

  理论物理通讯. 1984, 3(6): 771-781.

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  The Green function theory is successful in many fields of theoretical physics and the Bogoliubov-Gor'kov theory system is its important branch that involves many theoretical methods. In the last twenty years many papers have been published, but as all the equations of motion are coupled and their number is infinite, its global structure problem has not been investigated as yet. This paper is devoted to the study of its global structure, the exact decoupling problem, and the uniqueness and completeness problems. Some higher order spectral representation theorems and exact relationships between higher and lower order Green functions are obtained. Thus the equations of motion are decoupled exactly. In this paper it is proved that after cutting off the equations of motion are decoupled exactly and the solution of these equationsystemsmay not be unique. It is also proved that if there is one solution satisfying all the Green function's equations, then there must be a solution set, all of them satisfy all the equations and its number is infinite and the differences between them are arbitrary. By adding some limitations to ImG(x) at the regal axis a uniqueness theorem is proved.
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  SEEKING FOR THE U(5) LIMITING CASE OF IBA-Ⅱ

  剪知渐, 旷冶, 韩其智

  理论物理通讯. 1984, 3(6): 783-786.

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  In the region of even-even nuclei from A=96 to A=120, only the energy spectrum of ¹¹⁰₄₈Cd₆₂ may be described by IBA-Ⅱ involving the states {N_π +N _L -1,1}. But it can be described by IBA-Ⅰ too. To distinguish these two schemes, more angular momentum measurement is needed.
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  MASSES OF THE LIGHT HADRONS AND SELF-ENERGIES IN THE BAG MODEL

  杨新华, 钟毓澍, 程檀生

  理论物理通讯. 1984, 3(6): 787-793.

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  The masses of the light hadrons are calculated in terms. of the cloudy bag model with use of pion-energies due to both gluon and pion exchange. By use of a type of pion-guark interaction which incorporates the finite extent of the pion the convergent self-energy due to pion exchange is obtained. The difficulties in the bag models which only include one type of the self-energies can be removed by. taking account of both and the baryon spectrum is reproduced well. It is found that these self-energies are large but have opposite effect on the masses of the hadrons.