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Havana, Cuba

Otero J.A.,Institute Cibernetica | Rodriguez-Ramos R.,University of Habana | Monsivais G.,National Autonomous University of Mexico | Stern C.,National Autonomous University of Mexico | Lebon F.,CNRS Laboratory of Mechanics and Acoustics
Philosophical Magazine Letters | Year: 2013

We study the propagation of shear horizontal waves between the interface of piezoelectric and piezomagnetic half-spaces with a magneto-electro-mechanical imperfect contact. Mechanical, electrical and magnetical imperfections are modelled by means of a spring, a capacitor and a inductor, respectively. A general expression for the dispersion relation not reported previously in literature is given in an explicit form, with the diverse limit cases analysed in detail. In some of these limit cases, new expressions are also obtained which predict the existence of interfacial waves. In the other cases, when already reported results exist, a comparison with them is done. Some physical interpretations are derived from the limit cases. The influence of mechanical, electrical and magnetical imperfect contacts are shown in some numerical examples. © 2013 Taylor and Francis Group, LLC. Source

Gonzalez A.,Institute Cibernetica
Revista Cubana de Fisica | Year: 2014

We suggest a possible correlation between the ionization events caused by the background neutron radiation and the experimental data on mutations with damage in the DNA repair mechanism, coming from the Long Term Evolution Experiment in E. Coli populations. Source

Cabo Montes de Oca A.,Institute Cibernetica
European Physical Journal Plus | Year: 2014

The form of the resulting Feynman propagators in a proposed local and gauge invariant QCD for massive fermions suggests the existence of indefinite metric associated to quark states, a property that might relate it with the known Lee-Wick theories. Thus, the nature of the asymptotic free quark states in the theory is investigated here by quantizing the quadratic part of the quark action. As opposite to the case in the standard QCD, the free theory does not show Hamiltonian constraints. The propagation modes include a family of massless waves and a complementary set of massive oscillations. The theory can be quantized in a way that the massive modes show positive metric and the massless ones exhibit negative norms. It is remarked that, since QCD is expected to not exhibit gluon or quark asymptotic states, the presence of negative metric massless modes does not constitute a definite drawback of the theory. In addition, the fact that the positive metric quark states are massive, seems to be a good feature of the model, being consistent with the approximate existence of asymptotically free massive states in high-energy processes. © 2014 Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg. Source

Arenas Z.G.,Institute Cibernetica | Barci D.G.,State University of Rio de Janeiro
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2010

We present a functional formalism to derive a generating functional for correlation functions of a multiplicative stochastic process represented by a Langevin equation. We deduce a path integral over a set of fermionic and bosonic variables without performing any time discretization. The usual prescriptions to define the Wiener integral appear in our formalism in the definition of Green's functions in the Grassman sector of the theory. We also study nonperturbative constraints imposed by Becchi, Rouet and Stora symmetry (BRS) and supersymmetry on correlation functions. We show that the specific prescription to define the stochastic process is wholly contained in tadpole diagrams. Therefore, in a supersymmetric theory, the stochastic process is uniquely defined since tadpole contributions cancels at all order of perturbation theory. © 2010 The American Physical Society. Source

Gonzalez A.,Institute Cibernetica
Revista Cubana de Fisica | Year: 2015

We use Levy flights in the mutations space to model the temporal evolution of bacterial DNA. The model parameters fit the so-called Long Time Evolution Experiment on E. coli. Source

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