1982年, 第1卷, 第4期　
刊出日期：1982-07-30

  

• 全选
  |

• Select
  ON THEORY OF THE STATISTICAL GENERATING FUNCTIONAL FOR THE ORDER PARAMETER (III) -EFFECTIVE ACTION FORMALISM FOR THE ORDER PARAMETER

  周光召, 苏肇冰, 郝柏林, 于渌

  理论物理通讯. 1982, 1(4): 389-403.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  A practical scheme is proposed in this paper to determine the quantum statistical properties of the order parameter in the frame work of the closed time-path Green's functions (CTPGF). As a microscopic quantum theory, this formalism is applicable in principle to both equilibrium and nonequilibrium phenomena and is capable of dealing with statistical systems both above and below their phase transition point. This formalism can be used to discuss the statistical properties of simple as well as composite order parameters in either uniform or nonuniform systems. As simple illustrations and check for the theory, the proposed prescription.is applied to the contact-interaction model for superconductivity and a uninwde laser system coupled with two-energy-level bound electrons.
• Select
  A JUSTIFICATION FOR THE SCALING OF THE THOM-SYSTEM

  刘建民, 龚昌德

  理论物理通讯. 1982, 1(4): 405-412.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In the present paper we discuss the critical behavior of Thornsystem using Catastrophe Theory. The universal critical asymptotic form of the family of free energy functions for Thomsystem with one order parameter and two field parameters is obtained. The expressions of critical exponents, the scaling laws, and the scaling hypotheses are all derived from this universal asymptotic form.
• Select
  SYMMETRIY ANALYSIS OF CONVECTION PATTERNS

  陈式刚

  理论物理通讯. 1982, 1(4): 413-426.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this paper, we carry out a symmetry analysis of convection patterns of Newton-Boussinesg fluid in some finite containers. We also discuss, from the viewpoint of symtry analysis, the behaviour of infinitely extended fluid layer, as a limit of that in finite container, near convection threshold.
• Select
  TRANSVERSE TRANSPORT PROCESSES OF CHARGED PARTICLE SYSTEMS IN A STRONG MAGNETIC FIELD (I) Quantum Theory

  霍裕平, 胡希伟, 陈正雄

  理论物理通讯. 1982, 1(4): 427-440.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  The quantum theory of the transverse transport of charged particle systems in a strong, uniform magnetic field is reinvestigated in this article. All such previous theories, based on the Kubo formula in the Landau representation, only considered the second-order term of the collisional expansion series. However, if other high-order terms, especially the so-called reducible diagonal parts, are also considered, another second-order contribution is found, which exactly cancels the one derived prebiously. Hence, within the fxamwork of the usual theory, all the transverse transport coefficients would be identically zero. phis consequence is directly related to the local nature of the Landau eigen states.Only because previous calculations were incomplete did they obtain finite results.
• Select
  TRANSVERSE TRANSPORT PROCESSES OF CHARGED PARTICLE SYSTEMS IN A STRONG MAGNETIC FIELD (II) SOME DISCUSS IONS ABOUT THE BOLTZMANN EQUATION

  霍裕平

  理论物理通讯. 1982, 1(4): 441-448.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this article, it is pointed out that in a strong magnetic field the usual Boltzmann Equation with Lorentz force term is inconsistent with the fundamental requirements of the general theory of non-equilibrium statistical mechanics. Furthermore, if a collision term corresponding to particles in different gyroorbits is used, we find that all the transport coefficients are exactly zero.
• Select
  Λ-N INTERACTION AND THE STRUCTURE OF _Λ⁴He, _Λ⁴H, _Λ³He and _Λ³H

  吴慧芳, 沈建平, 余友文, 张宗烨

  理论物理通讯. 1982, 1(4): 449-457.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  The purpose of this paper is to study the A-N interaction by using the meson exchange theory. We have considered four processes:l) Single K meson exchange, 2) Single η and single ω meson exchange, 3) Box diagrams of 2π and πp exchanges with the intermediate states of ΣN, and 4) Box diagrams of 2π and πp exchanges with the intermediate states of ΣΔ. For simplicity, the zero initial momentum approximation and the closure approximation have been taken in the calculation. The results are reasonable and consistent with experimental data. Especially for the cases of _Λ⁴He and, _Λ⁴H, the tMoretica1 spectra of, _Λ⁴He and _Λ⁴H are in good agreement with experimental data.
• Select
  SYMMETRY BASIS AND PHYSICAL BASIS FOR MANYs-QUARK SYSTEM

  施义晋

  理论物理通讯. 1982, 1(4): 459-468.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this paper, a general expression for transformation coefficients between the symetry basis and physical basis of the many-quark system has been given. For tne channel with (TS) =(0l) of a six-quark system, the transformation coefficients have been calculated. Interpreting again the fractional-parentage expansions of symmetry basis, we pointed out that the fractional parentage coefficients are essentially the Clebsch-Gordon coefficients for the corresponding SU group.
• Select
  DYNAMICAL SYMMETRY BREAKING IN MODELS OF SPIMOR FIELDS WITH QUARTIC INTERACTIONS IN (1+1) DIMENSIONS

  汪荣泰, 倪光炯

  理论物理通讯. 1982, 1(4): 469-483.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  A nonperturbative method, namely, variarional method together with canonical transformations, is developtd to study dyndcal symmetry breaking. This method has been applied in the models of two dimensional massless fermion fields with quartic interactions. The results imply that the mechanism of dynamical symmetry breaking bears some analogy to the phenomenon of superconductivity. The new vacuum |õ> is just a relativistic BCS groundstate, In this vacuum |õ>, we can observe a quasi-particle with mass "MP" Furthermore, correlative vacuum |õ> exists and the mesons emerge with masses "O" and "2M_F". It is also shown that dynamical symmetry breaking always occurs in the models with infrared slavery and asymptotic freedom, while it is meaningless to dis-cuss dynamical symmetry breaking in infrared stable theory.
• Select
  NOETHER ANALYSIS AND INFINITELY CONSERVED CURRENTS IN SUPER-CHIRAL MODEL

  冯元平, 葛墨林

  理论物理通讯. 1982, 1(4): 485-493.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  A systematic procedure in writing down the infinite set of nonlocal conserved currents for a super-chiral model is given via Noether analysis. The first three conserved currents are explicitly shown.
• Select
  CONNECTION THEORY OF FIBRE BUNDLE AND PROLONGATION STRUCTURES OF NONLINEAR EVOLUTION EQUATIONS

  郭汉英, 向延育, 吴可

  理论物理通讯. 1982, 1(4): 495-505.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  It is shown that the proper geometrical framework for the nonlinear evolution equations (NEEs) and the soliton equations Should be the fibre bundle theory, the principal bundle and its associated bundle and their connection theory. Based upon the requirement of covariance of the geometrical quantities, a covariant generic geometry theory for the prolongation strutures of the NEEs is proposed and the fundamental equations for the prolongation structures are presented. From the fundamental equations it immediately follows that the comections corresponding to these NEEs always flat but with torsion and the covariant formulae satisfied by the conservation quantities associated with these NEEs are obtained. The prolongation structure of the MKdV equation, as an example, is concretely worked out by means of the covariant theory of the prolongation structure presented in this paper.
• Select
  A NUMERICAL METHOD FOR TWO-DIMENSIONAL FOKKER-PLANCK EQUATION

  杨应辉, 吴锡真, 彭清泉

  理论物理通讯. 1982, 1(4): 507-513.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this paper, a general method for solving the two-dimensional F-P equation numerically is presented which can be applied to the study of the fission processes of systems with any forms of potentials and any viscosity as well as other processes, such as heavy ion. collisions.
• Select
  THE APPLICATION OF ADIABATIC THEOREM TO THE BEAA DYNAMICS IN ACCELERATORS

  方守贤, 国智元, 吴英志

  理论物理通讯. 1982, 1(4): 515-525.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this paper, the adiabatic criterion and the formulae for calculating the increment of adiabatic invariant due to the nonadiabatic change of paramters in Hamiltonian are derived and we have found that this increment is quite small, even in the case where the Landau's adiabatic criterion^[1] is violated.
• Select
  COULD ⁷Be BE DESTROYED BY NEUTRON ABSORPTION IN THE SUN? -A NOTE ON THE SOLAR NEUTRINO PUZZLE

  黄祖洽

  理论物理通讯. 1982, 1(4): 527-530.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  A comparison is made between the rate of the ⁷Be(p,y) ⁸B reaction and the rate of the neutron absorption reaction ⁷Be(n,p) ⁷Li which might have been important in. destroying ⁷Be in the solar interior.
• Select
  ABNORMAL NEUTRON STARS WITH ABNORMAL PROTONS III, METASTABLE STARS AND PHASE TRANSITION

  曲钦岳, 汪珍如

  理论物理通讯. 1982, 1(4): 531-534.

  摘要 ( ) PDF全文 ( )   可视化   收藏

  In this paper, the abnormal neutron stars containing abnormal protons are compared with the normal neutron stars in order to determine which of them are metastable and the phase transition between netastable and stable stars is discussed.