摘要:

AbstractAnalytic properties of the causal Green's function in statistical mechanics are investigated. It is shown that the causal function can be obtained as a certain limit of an analytic function. The dual field introduced by Umezawa and Takahashi in their field‐theoretical formulation of statistical mechanics (thermo field dynamics), plays an important role to make the spectral functions real. In a few examples, it is shown explicitly that the Feynman diagram technique is applicable in the thermo‐field dynam

ISSN:0015-8208    

DOI:10.1002/prop.19770250101

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

ISSN:0015-8208    

DOI:10.1002/prop.19770250102

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractWe study the transformation behaviour of any covariant component ϕAB(x) obtained from a spinorial field operator ϕAB(x) by Fourier decomposition on the centre of the universal covering group of the conformal group for four dimensional Minkowski spac

ISSN:0015-8208    

DOI:10.1002/prop.19770250103

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

ISSN:0015-8208    

DOI:10.1002/prop.19770250104

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractWe present the main ideas behind the statistical bootstrap model and recent developments within this model related to the description of fireball cascade decay.Mathematical methods developed in this model might be useful in other phenomenological schemes of strong interaction physics; they are described in detail.We discuss the present status of applications of the model to various hadronic reactions.When discussing the relations of the statistical bootstrap model to other models of hadron physics we point out possibly fruitful analogies and dynamical mechanisms which are modelled by the bootstrap dynamics under definite conditions. This offers interpretations for the critical temperature typical for the model and indicates further fields of application.

ISSN:0015-8208    

DOI:10.1002/prop.19770250105

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractA review of the theory of the stimulated resonance Raman scattering (SRRS) is given.The calculation of the gains for the SRRS with the ground level (SRRS I) or an excited one (SRRS II) as initial states shows that there are some restrictions for their appearance. Due to the strong resonance absorption of the pumping wave and the disturbing influence of stimulated fluorescence the SRRS I is not observable in a Franck‐Condon excitation and in an absorption of Lorentzian line shape.The SRRS II has a sufficiently large gain on the condition τel≪vib(τel, τvib– transversal relaxation time of the electronic or vibronic transition). In case of a strong deviation of the wings of the absorption profile from the Lorentzian shape, however, the SRRS I is favoured rather than the two other processes.Another possibility to avoid the resonance absorption of the pumping wave exists for the transversal excitation of the SRRS. Thereby the limit of application of the SRRS may be extended to other substances which are no saturable absorbers.Apart from the saturable absorption and the transversal excitation the self‐induced transparency is the third possibility to generate SRRS of ultrashort li

ISSN:0015-8208    

DOI:10.1002/prop.19770250106

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

ISSN:0015-8208    

DOI:10.1002/prop.19770250107

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractIn this paper a rigorous derivation of the boson method foranisotropicsuperconductors is presented. A most general form of macroscopic equations for the current and magnetic field is obtained from the assumption that the Lagrangian is gauge invariant. We then proceed to explain what kind of approximations can be introduced in order to simplify these macroscopic equations. We formulate the results in a form convenient for analysing the magnetic properties of anisotropic superconductors. An improved version of analysis for the vortex normal‐core energy is also presente

ISSN:0015-8208    

DOI:10.1002/prop.19770250108

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractThe Thirring and the Schwinger models both massless and massive are discussed as prototypes for theories with topological quantum numbers and confinement respectively.Bosonization of the fermion field is introduced from the beginning allowing a unified treatment of various models. An analysis of their charge sectors clarifies the relation between the periodicity of the potential in the bosonized version of those models and the existence of an additive quantum number.A brief outline of the essential features discussed which may survive in 4‐dimensional space‐time is made in the last sect

ISSN:0015-8208    

DOI:10.1002/prop.19770250109

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY

摘要:

AbstractMagnetic moments of long lived high spin isomers can be measured to high precision by a number of different methods applicable in different ranges of half lives. The high spin states in the Hf‐ and Pb‐region have a relatively simple and well understood structure. An analysis of the magnetic moments of these states gives the following results:iThe additivity theorem is fulfilled.iiThe agreement between experimental and calculated values is satisfactory.iiiIn many cases the moment can contribute to the clarification of the structure of the state.ivThe influence of mesonic exchange currents on thegl‐factor can be determined experimen

ISSN:0015-8208    

DOI:10.1002/prop.19770250110

出版商:WILEY‐VCH Verlag    

年代:1977

数据来源: WILEY