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  • 1
    Publication Date: 2013-10-01
    Description: Author(s): F. Bagarello Using as a prototype example the harmonic oscillator we show how losing self-adjointness of the Hamiltonian H changes drastically the related functional structure. In particular, we show that even a small deviation from strict self-adjointness of H produces two deep consequences, not well understood... [Phys. Rev. A 88, 032120] Published Mon Sep 30, 2013
    Keywords: Fundamental concepts
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
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  • 2
    Publication Date: 2015-10-21
    Description: We demonstrate that not all generalized Bogoliubov transformations lead to D -pseudo-bosons and prove that a correspondence between the two can only be achieved with the imposition of specific constraints on the parameters defining the transformation. For certain values of the parameters, we find that the norms of the vectors in sets of eigenvectors of two related apparently non-selfadjoint number-like operators possess different types of asymptotic behavior. We use this result to deduce further that they constitute bases for a Hilbert space, albeit neither of them can form a Riesz base. When the constraints are relaxed, they cease to be Hilbert space bases but remain D -quasibases.
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
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  • 3
    Publication Date: 2014-03-12
    Description: Author(s): F. Bagarello and F. Gargano We discuss the role of pseudofermions in the analysis of some two-dimensional models, recently introduced in connection with non-self-adjoint Hamiltonians. Among other aspects, we discuss the appearance of exceptional points in connection with the validity of the extended anticommutation rules which... [Phys. Rev. A 89, 032113] Published Tue Mar 11, 2014
    Keywords: Fundamental concepts
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
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  • 4
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    American Institute of Physics (AIP)
    Publication Date: 2016-04-19
    Description: It is a well known fact that the Black-Scholes equation admits an alternative representation as a Schrödinger equation expressed in terms of a non-self-adjoint Hamiltonian. We show how pseudo-bosons , linear or not, naturally arise in this context, and how they can be used in the computation of the pricing kernel.
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
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  • 5
    Publication Date: 2016-10-08
    Description: This paper is devoted to the construction of what we will call exactly solvable models , i.e., of quantum mechanical systems described by an Hamiltonian H whose eigenvalues and eigenvectors can be explicitly constructed out of some minimal ingredients . In particular, motivated by PT-quantum mechanics, we will not insist on any self-adjointness feature of the Hamiltonians considered in our construction. We also introduce the so-called bicoherent states, we analyze some of their properties and we show how they can be used for quantizing a system. Some examples, both in finite and in infinite-dimensional Hilbert spaces, are discussed.
    Print ISSN: 0022-2488
    Electronic ISSN: 1089-7658
    Topics: Mathematics , Physics
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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.
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  • 10
    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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