227 research outputs found

    A note on static dyonic diholes

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    In this brief note we argue that a dyonic generalization of the Emparan-Teo dihole solution is described by a static diagonal metric and therefore, contrary to the claim made in a recent paper by Cabrera-Munguia et al., does not involve any "non-vanishing global angular momentum" and rotating charges.Comment: 4 pages, 1 figure; typos corrected, matches the published versio

    Towards Noncommutative Linking Numbers Via the Seiberg-Witten Map

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    In the present work some geometric and topological implications of noncommutative Wilson loops are explored via the Seiberg-Witten map. In the abelian Chern-Simons theory on a three dimensional manifold, it is shown that the effect of noncommutativity is the appearance of 6n6^n new knots at the nn-th order of the Seiberg-Witten expansion. These knots are trivial homology cycles which are Poincar\'e dual to the high-order Seiberg-Witten potentials. Moreover the linking number of a standard 1-cycle with the Poincar\'e dual of the gauge field is shown to be written as an expansion of the linking number of this 1-cycle with the Poincar\'e dual of the Seiberg-Witten gauge fields. In the process we explicitly compute the noncommutative 'Jones-Witten' invariants up to first order in the noncommutative parameter. Finally in order to exhibit a physical example, we apply these ideas explicitly to the Aharonov-Bohm effect. It is explicitly displayed at first order in the noncommutative parameter, we also show the relation to the noncommutative Landau levels.Comment: 19 pages, 1 figur

    Taller de reciclado en el nivel medio superior y su implementación para la elaboración de material didáctico

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    Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Biología) UANLUANLhttp://www.uanl.mx

    Enfermedad de Lyme: Un ente en espera de reconocimiento

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    La borreliosis de Lyme es un padecimiento reconocido en Europa y EUA producida por una espiroqueta a la que se le ha dado el nombre de Borrelia burgdorferi debido a su descubridor, el Dr. Willy Burgdorfer, quien la aisló a partir de garrapatas infectadas con este agente, esta bacteria es transmitida por insectos hematofagos y afecta al hombre y a la mayoría de los animales domésticos. Las características clínicas principales de la enfermedad de Lyme en su fase temprana son: La aparición de una lesión anular expansiva en la piel, a la cual se denomina eritema crónico migratorio (etapa 1), anormalidades cardiacas y neurológicos (etapa 2), y por ultimo problemas artríticos (etepa 3)
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