35 research outputs found

    Space time geometry in the atomic hydrogenoid system. Approach to a dust relativistic model from causal quantum mechanics

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    [EN] We intend to use the description of the electron orbital trajectory in the de Broglie-Bohm (dBB) theory to assimilate to a geodesic corresponding to the General Relativity (GR) and get from it physical conclusions. The dBB approach indicates us the existence of a non-local quantum field (corresponding with the quantum potential), an electromagnetic field and a comparatively very weak gravitatory field, together with a translation kinetic energy of electron. If we admit that those fields and kinetic energy can deform the space time, according to Einstein¿s field equations (and to avoid the violation of the equivalence principle as well), we can made the hypothesis that the geodesics of this space-time deformation coincide with the orbits belonging to the dBB approach (hypothesis that is coherent with the stability of matter). From it, we deduce a general equation that relates the components of the metric tensor. Then we find an appropriate metric for it, by modification of an exact solution of Einstein¿s field equations, which corresponds to dust in cylindrical symmetry. The found model proofs to be in agreement with the basic physical features of the hydrogen quantum system, particularly with the independence of the electron kinetic momentum in relation with the orbit radius. Moreover, the model can be done Minkowski-like for a macroscopic short distance with a convenient election of a constant. According to this approach, the guiding function of the wave on the particle could be identified with the deformations of the space-time and the stability of matter would be easily justified by the null acceleration corresponding to a geodesic orbit.One of us, MJFA, is partially supported in his work by the Spanish Ministry of Economía y Competitividad, MICINN-FEDER project FIS2015-64552-P.Gómez-Blanch, G.; Kotsireas, I.; Gkigkitzis, I.; Haranas, I.; Fullana Alfonso, MJ. (2018). Space time geometry in the atomic hydrogenoid system. Approach to a dust relativistic model from causal quantum mechanics. Revista Mexicana de Física. 64(1):18-29. http://hdl.handle.net/10251/123543S182964

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    An investigation of uniform expansions of large order Bessel functions in Gravitational Wave Signals from Pulsars

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    In this work, we extend the analytic treatment of Bessel functions of large order and/or argument. We examine uniform asymptotic Bessel function expansions and show their accuracy and range of validity. Such situations arise in a variety of applications, in particular the Fourier transform of the gravitational wave signal from a pulsar. The uniform expansion we consider here is found to be valid in the entire range of the argument

    Hadamard ideals and Hadamard matrices with two circulant cores

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    We apply Computational Algebra methods to the construction of Hadamard matrices with two circulant cores, given by Fletcher, Gysin and Seberry. We introduce the concept of Hadamard ideal, to systematize the application of Computational Algebra methods for this construction. We use the Hadamard ideal formalism to perform exhaustive search constructions of Hadamard matrices with two circulant cores for the twelve orders 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52. The total number of such Hadamard matrices is proportional to the square of the parameter. We use the Hadamard ideal formalism to compute the proportionality constants for the twelve orders listed above. Finally, we use the Hadamard ideal formalism to improve the lower bounds for the number of inequivalent Hadamard matrices for the seven orders 44, 48, 52, 56, 60, 64, 68

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