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Geyer, H.B.
17. and 18. Annual seminar on theoretical physics, Stellenbosch, 13-15 Jul 1982, Pretoria, 11-15 Jul 19831984
17. and 18. Annual seminar on theoretical physics, Stellenbosch, 13-15 Jul 1982, Pretoria, 11-15 Jul 19831984
AbstractAbstract
[en] Seniority is shown to provide a guiding principle in the construction of physical bosons. Within the framework of a single j-shell physical boson operators are constructed using the Dyson mapping
Original Title
Senioriteit en fisiese bosone
Primary Subject
Source
Organization of Theoretical Physicists, Pretoria (South Africa); South African Inst. of Physics, Faure. Subgroup for Theoretical Physics; 395 p; ISBN 0 86960 760 X;
; 1984; p. 289-316; 18. Annual seminar on theoretical physics; Pretoria (South Africa); 11-15 Jul 1983

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Miscellaneous
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Conference
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Bedford, D.; Wang, D.
17. and 18. Annual seminar on theoretical physics, Stellenbosch, 13-15 Jul 1982, Pretoria, 11-15 Jul 19831984
17. and 18. Annual seminar on theoretical physics, Stellenbosch, 13-15 Jul 1982, Pretoria, 11-15 Jul 19831984
AbstractAbstract
No abstract available
Primary Subject
Source
Organization of Theoretical Physicists, Pretoria (South Africa); South African Inst. of Physics, Faure. Subgroup for Theoretical Physics; 395 p; ISBN 0 86960 760 X;
; 1984; p. 391-393; 18. Annual seminar on theoretical physics; Pretoria (South Africa); 11-15 Jul 1983; Published in summary form only.

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Miscellaneous
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Conference
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AbstractAbstract
[en] A method is given of constructing new classes of potential V and corresponding wave functions in a closed analytical form uisng the known solutions to the Schroedinger equation with some potential V for energy E and angular momentum l along arbitrary lines in the (l + 1/2)2,E) plane. The Crum-Krein transformations which give solutions for fixed l and any E (or their modification for fixed E and different values l) are a particular case of the suggested formalism. (Auth.)
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Journal Article
Journal
Physica Scripta; ISSN 0031-8949;
; v. 29(6); p. 515-517

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AbstractAbstract
[en] For a Hamiltonian of the form H = (1)/(2) ( p-A(r,t))2+V(r,t), the conditions on the scalar and vector potentials V(r,t) and A(r,t) have been found such that there exists an exact invariant that is quadratic in each component of the canonical momentum p. The invariant is written in the form I(r,p,t) = (1)/(2) (f2(r,t)xp-f1(r,t))2+f0(r,t), where f2 is a nonsingular symmetric real dyad, f1 is a real vector, and f0 is a real scalar. For the cases in which f2 is proportional to the unit dyad, or the vector potential is identically zero and f2 commutes with the time derivative of f2, all of the potentials that satisfy the conditions for such invariants to exist have been found explicitly and the invariants have been found in terms of the potentials. The derivation is a generalization of a method reported by Lewis and Leach for the corresponding one-dimensional problem. For the case in which the vector potential vanishes identically, the result is a generalization of a result found in three dimensions by Chandrasekhar. The results presented are applicable in plasma physics and stellar dynamics
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Secondary Subject
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Journal Article
Journal
J. Math. Phys. (N.Y.); ISSN 0022-2488;
; v. 25(4); p. 1139-1143

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AbstractAbstract
[en] A variational solution to a model problem of a hydrogen atom near a sharp planar surface of a semi-infinite substrate is studied. Results are presented for the ground and excited eigenstates and dipole moments of the hydrogen atom as a function of distance from the surface for two models: (a) a system in which the half-space occupied by the solid is represented by an infinite potential step; and (b) a system in which the semi-infinite substrate is perfectly imaging subject to a boundary condition that excludes the atomic electron from the substrate. Model (b) is considered as an idealized model for physisorption, where the exclusion of the electron simulates the exchange repulsion originating from the overlap of the atomic and substrate electrons. Results for the physisorption holding potential as a function of distance from the plane are presented and discussed
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Journal Article
Journal
Journal of Chemical Physics; ISSN 0021-9606;
; v. 80(4); p. 1691-1702

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AbstractAbstract
[en] The standard s-state Potts model is generalized to a model defined on plaquettes of Zsup(d), and the s->1, 0 limits are shown to correspond to plaquette percolation and percolation of plaquette trees, respectively. The model is further extended to r-cells (cubes, hypercudes, etc). On Zsup(d) and the s->1, 0 limits are exhibited. (orig.)
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Source
CONTRACT PHY-8117463; PHY-8116101 A01; CODEN: NUPBB.
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Journal Article
Journal
Nuclear Physics. B; ISSN 0550-3213;
; v. 235(1); p. 19-23

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AbstractAbstract
[en] An alternative exact-path-integral treatment of the hydrogen atom is proposed. The earlier treatment is based on the bijective transformation of Kustaanheimo and Stiefel. The proposed procedure reduces the radial path integral for the hydrogen atom into that for an oscillator in R3 by one-to-one mapping. (orig.)
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Journal Article
Journal
Physics Letters. A; ISSN 0375-9601;
; v. 101(5/6); p. 253-257

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[en] The Bell inequalities, being derived for micro-systems, cannot be tested by (macroscopic) experiments without additional assumptions. A macroscopic definition of local realism is proposed which might be the starting point for deriving Bell inequalities testable without auxiliary assumptions. (orig.)
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Journal Article
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Physics Letters. A; ISSN 0375-9601;
; v. 101(8); p. 379-382

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AbstractAbstract
[en] The general solution to finding the continuous QND observables of a given system is obtained. The method is also extended to finding the QNDF observables of the system. An example is given, using the harmonic oscillator. (orig.)
Primary Subject
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Journal Article
Journal
Physics Letters. A; ISSN 0375-9601;
; v. 102(1/2); p. 18-20

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AbstractAbstract
[en] We consider self-adjoint realizations of Schroedinger operators: Hsub(ω)=-d2/dt2 + qsub(ω)(t) depending on a parameter ω running through a probability space. (orig./HSI)
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Source
7. international conference on mathematical physics; Boulder, CO (USA); 1-10 Aug 1983; CODEN: PHYAD.
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Journal Article
Literature Type
Conference
Journal
Physica A; ISSN 0378-4371;
; v. 124(1-3); p. 181-187

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