Escuela Superior de Fisica y Matematicas del IPN

Mexico City, Mexico

Escuela Superior de Fisica y Matematicas del IPN

Mexico City, Mexico

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Cordero R.,Escuela Superior de Fisica y Matematicas Del IPN | Cruz M.,CINVESTAV | Molgado A.,Autonomous University of San Luis Potosi | Molgado A.,DUAL CP Institute of High Energy Physics | Rojas E.,University of Veracruz
Classical and Quantum Gravity | Year: 2012

We explore the cosmological implications provided by the geodetic brane gravity action corrected by an extrinsic curvature brane term, describing a codimension-1 brane embedded in a 5D fixed Minkowski spacetime. In the geodetic brane gravity action, we accommodate the correction term through a linear term in the extrinsic curvature swept out by the brane. We study the resulting geodetic-type equation of motion. Within a Friedmann-Robertson-Walker metric, we obtain a generalized Friedmann equation describing the associated cosmological evolution. We observe that, when the radiation-like energy contribution from the extra dimension is vanishing, this effective model leads to a self-(non-self)-accelerated expansion of the brane-like universe in dependence on the nature of the concomitant parameter β associated with the correction, which resembles an analogous behaviour in the DGP brane cosmology. Several possibilities in the description for the cosmic evolution of this model are embodied and characterized by the involved density parameters related in turn to the cosmological constant, the geometry characterizing the model, the introduced β parameter as well as the dark-like energy and the matter content on the brane. © 2012 IOP Publishing Ltd.


Juarez-Leon C.,Escuela Superior de Fisica y Matematicas Del IPN | Martinez A.,Escuela Superior de Fisica y Matematicas Del IPN | Neri M.,Escuela Superior de Fisica y Matematicas Del IPN | Torres J.J.,Escuela Superior de Computo Del IPN | Flores-Mendieta R.,Autonomous University of San Luis Potosi
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

We calculate the model-independent radiative corrections to the Dalitz plot of Kl3± decays to the order of (α/π)(q/M1), where q is the momentum transfer and M1 is the mass of the kaon. The final results are presented, first, with the triple integration over the variables of the bremsstrahlung photon ready to be performed numerically and, second, in an analytical form. These two forms are useful to cross-check on one another and with other calculations. This paper is organized to make it accessible and reliable in the analysis of the Dalitz plot of precision experiments and is not compromised to fixing the form factors at predetermined values. It is assumed that the real photons are kinematically discriminated. Otherwise, our results have a general model-independent applicability. © 2011 American Physical Society.


Barranco-Jimenez M.A.,Escuela Superior de Computo del IPN | Sanchez-Salas N.,Escuela Superior de Fisica y Matematicas del IPN | Angulo-Brown F.,Escuela Superior de Fisica y Matematicas del IPN
Entropy | Year: 2011

In the present paper, the thermoeconomic optimization of an irreversible solar-driven heat engine model has been carried out by using finite-time/finite-size thermodynamic theory. In our study we take into account losses due to heat transfer across finite time temperature differences, heat leakage between thermal reservoirs and internal irreversibilities in terms of a parameter which comes from the Clausius inequality. In the considered heat engine model, the heat transfer from the hot reservoir to the working fluid is assumed to be Dulong-Petit type and the heat transfer to the cold reservoir is assumed of the Newtonian type. In this work, the optimum performance and two design parameters have been investigated under two objective functions: the power output per unit total cost and the ecological function per unit total cost. The effects of the technical and economical parameters on the thermoeconomic performance have been also discussed under the aforementioned two criteria of performance. © 2011 by the authors.


Garcia-Compean H.,CINVESTAV | Turrubiates F.J.,Escuela Superior de Fisica y Matematicas Del IPN
International Journal of Modern Physics A | Year: 2011

The deformation quantization formalism is applied to the linearized gravitational field. Standard aspects of this formalism are worked out before the ground state Wigner functional is obtained. Finally, the propagator for the graviton is also found within the context of this formalism. © 2011 World Scientific Publishing Company.


Morais J.,University of Aveiro | Perez-De La Rosa M.A.,Escuela Superior de Fisica y Matematicas Del IPN
Mathematical Methods in the Applied Sciences | Year: 2015

Over the past few years, considerable attention has been given to the role played by the Lamé's Wave Functions (LWFs) in various problems of mathematical physics and mechanics. The LWFs arise via the method of separation of variables for the wave equation in ellipsoidal coordinates. The present paper introduces the Lamé's Quaternionic Wave Functions (LQWFs), which extend the LWFs to a non-commutative framework. We show that the theory of the LQWFs is determined by the Moisil-Theodorescu type operator with quaternionic variable coefficients. As a result, we explain the connections between the solutions of the Lamé's wave equation, on one hand, and the quaternionic hyperholomorphic and anti-hyperholomorphic functions on the other. We establish analogues of the basic integral formulas of complex analysis such as Borel-Pompeiu's, Cauchy's, and so on, for this version of quaternionic function theory. We further obtain analogues of the boundary value properties of the LQWFs such as Sokhotski-Plemelj formulae, the Dα-hyperholomorphic extension of a given Hölder function and on the square of the singular integral operator. We address all the text mentioned earlier and explore some basic facts of the arising quaternionic function theory. We conclude the paper showing that the spherical, prolate, and oblate spheroidal quaternionic wave functions can be generated as particular cases of the LQWFs. Copyright © 2015 John Wiley & Sons, Ltd.


Perez J.L.,University of Guanajuato | Cordero R.,Escuela Superior de Fisica Y Matematicas del IPN | Urena-Lopez L.A.,University of Guanajuato
AIP Conference Proceedings | Year: 2012

We study the cosmology of a two-brane model in a five-dimensional spacetime, where the extra spatial coordinate is compactifed on an orbifold. Additionally, we consider the existence on each brane of matter fields that evolve in time. Solving the Einstein equations in a vacuum bulk, we can show how the matter fields in both branes are connected and they do not evolve independently. © 2012 American Institute of Physics.


Perez J.L.,University of Guanajuato | Cordero R.,Escuela Superior de Fisica Y Matematicas del IPN | Urena-Lopez L.A.,University of Guanajuato
AIP Conference Proceedings | Year: 2011

We present the study of two 3-brane system embedded in a 5-dimensional space-time in which the fifth dimension is compactified on a S 1/Z2 orbifold. Assuming isotropic, homogeneous, and static branes, it can be shown that the dynamics of one brane is dominated by the other one when the metric coefficients have a particular form. We study the resulting cosmologies when one brane is dominated by a given single-fluid component. © 2011 American Institute of Physics.


Cordero R.,Escuela Superior de Fisica Y Matematicas del IPN | Rojas E.,University of Veracruz
AIP Conference Proceedings | Year: 2011

We give a brief overview of several models in brane-world cosmology. In particular, we focus on the asymmetric DGP and Regge-Teiltelboim models. We present the associated equations of motion governing the dynamics of the brane and their corresponding Friedmann-like equations. In order to develop the quantum Regge-Teiltelboim type cosmology we construct its Ostrogradski Hamiltonian formalism which naturally leads to the corresponding Wheeler-DeWitt equation. In addition, we comment on possible generalizations for these models including second order derivative geometrical terms. © 2011 American Institute of Physics.


Maldonado-Ramirez M.,Escuela Superior de Fisica y Matematicas Del I.P.N. | Rzedowski-Calderon M.,CINVESTAV | Villa-Salvador G.,CINVESTAV
Finite Fields and their Applications | Year: 2013

We give a construction of genus fields for congruence function fields. First we consider the cyclotomic function field case following the ideas of Leopoldt and then the general case. As applications we give explicitly the genus fields of Kummer, Artin-Schreier and cyclic p-extensions. Kummer extensions were obtained previously by G. Peng and Artin-Schreier extensions were obtained by S. Hu and Y. Li. © 2012 Elsevier Inc.


Cordero R.,Escuela Superior de Fisica y Matematicas Del IPN | Garcia-Compean H.,CINVESTAV | Turrubiates F.J.,Escuela Superior de Fisica y Matematicas Del IPN
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

The Weyl-Wigner-Groenewold-Moyal formalism of deformation quantization is applied to cosmological models in the minisuperspace. The quantization procedure is performed explicitly for quantum cosmology in a flat minisuperspace. The de Sitter cosmological model is worked out in detail and the computation of the Wigner functions for the Hartle-Hawking, Vilenkin and Linde wave functions are done numerically. The Wigner function is analytically calculated for the Kantowski-Sachs model in (non)commutative quantum cosmology and for string cosmology with dilaton exponential potential. Finally, baby universes solutions are described in this context and the Wigner function is obtained. © 2011 American Physical Society.

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