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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 42 (2001), S. 5116-5129 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this article we prove that any multi-resolution analysis of L2(R) produces, for some values of the filling factor, a single-electron wave function of the lowest Landau level (LLL) which, together with its (magnetic) translation, gives rise to an orthonormal set in the LLL. We also discuss the inverse construction. Moreover, we extend this procedure to the higher Landau levels and we discuss the analogies and the differences between this procedure and the one previously proposed by J.-P. Antoine and the author. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 39 (1998), S. 6091-6105 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this paper we discuss some physical applications of topological*-algebras of unbounded operators. The first example is a simple system of free bosons. Then we consider other models related to this one. Finally, we discuss the time evolution of two interacting models of matter and bosons. We show that for all these systems it is possible to build up a common mathematical framework where the existence of the thermodynamical limit of the algebraic dynamics can be conveniently analyzed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 4219-4234 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The problem of the existence of the thermodynamical limit of the algebraic dynamics for a class of spin systems is considered in the framework of a generalized algebraic approach in terms of a special class of quasi*-algebras, called CQ*-algebras. Physical applications to (almost) mean-field models and to bubble models are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 405-418 
    ISSN: 0392-6737
    Keywords: General mathematical and computational developments ; Other multiple resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta un metodo iterativo per ottenere una soluzione esatta dell'equazione differenziale $$i\dot a = \hat H(t)a$$ , con Ĥ una matrice 3×3 hermitiana eda il vettore incognito. La procedura è particolarmente adatta ad un trattamento numerico e, come esempio, è stata applicata per trovare la probabilità d'eccitazione di un atomo a tre livelli dopo il passaggio simultaneo di due impulsi laser di cui ognuno quasi risonante con una coppia di livelli atomici.
    Abstract: Резюме Предлагается итерационный метод получения решения дифференциального уравнения $$i\dot a = \hat H(t)a$$ , где Ĥ есть эрмитова матрица 3×3a-неизвестный вектор. Предложенная процедура решеня является удобной для компьтерных вычислений. Рассматривается пример: определение вероятности возбуждения атома с тремя уровнями после синхронного прохождения двух лазерных импульсов, каждый из которых имеет почти резонансную частоту с парой атомных уровней.
    Notes: Summary An iterative method to obtain a solution of the differential equation $$i\dot a = \hat H(t)a$$ , with Ĥ a 3×3 Hermitian matrix anda the unknown vector, is proposed. The procedure is particularly suitable for computer implementation and, as an example, has been applied to find the excitation probability of a three-level atom after the synchronous passage of two laser pulses each almost resonant with a pair of atomic levels.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International journal of theoretical physics 38 (1999), S. 1593-1615 
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we continue analyzing the possibleapplications of nonstandard analysis to variationalproblems, with particular interest in classicalmechanics. In particular, we adapt various techniques of numerical analysis to solve the nonstandardversion of the Euler-Lagrange equation for both one- andmultidimensional systems. We also start an introductoryanalysis of the inverse problem of the calculus of variation, identifying a class ofnonstandard difference equations for which a first-orderLagrangian can be obtained.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 66 (1992), S. 849-866 
    ISSN: 1572-9613
    Keywords: Mean-field spin models ; infinite-volulme limit ; dynamics of systems with long-range interactions ; dynamics out of equilibrium ; differential equations inC * and von Neumann algebras ; spontaneous symmetry breaking ; generalized Goldstone's theorem ; KMS condition and long-range interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The infinite-volume limit of the dynamics of (generalized) mean-field spin models is obtained through a direct analysis of the equations of motion, in a large class of representations of the spin algebra. The resulting dynamics fits into a general framework for systems with long-range interaction: variables at infinity appear in the time evolution of local variables and spontaneous symmetry breaking with an energy gap follows from this mechanism. The independence of the construction of the approximation scheme in finite volume is proven.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of theoretical physics 38 (1999), S. 1569-1592 
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the framework of nonstandard analysis, Ifind the discretized version of the Euler-Lagrangeequation for classical dynamical systems and discuss theexistence of an extremum for a given functional in variational calculus. Some results relatedto the Cauchy existence theorem are obtained anddiscussed with various examples.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 65 (1991), S. 469-482 
    ISSN: 1572-9613
    Keywords: Spin systems ; algebraic approach ; thermodynamical limit
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the thermodynamic limit of the algebraic dynamics for an “almost” mean-field Ising model, which is a slight generalization of the Ising model in the mean-field approximation. We prove that there exists a family of „relevant” states on which the algebraic dynamicsα t can be defined. Thisα t defines a group of automorphisms of the algebra obtained by completing the standard spin algebra with respect to the quasiuniform topology defined by our states.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    International journal of theoretical physics 27 (1988), S. 557-566 
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After a rigorous introduction to hyperreal numbers, we give in terms of non standard analysis, (1) a Lagrangian statement of classical physics, and (2) a statement of formal quantum scattering.
    Type of Medium: Electronic Resource
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