Navegando por Autor "Silva, A.J."

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Effective field theory of quantum gravity coupled to scalar electrodynamics
(IOP Publishing, 2016-04-13) Beviláquia, Leandro Ibiapina; Lehum, A.C.; Silva, A.J.
In this work, we use the framework of effective field theory to couple Einstein's gravity to scalar electrodynamics and determine the renormalization of the model through the study of physical processes below Planck scale, a realm where quantum mechanics and general relativity are perfectly compatible. We consider the effective field theory up to dimension six operators, corresponding to processes involving one-graviton exchange. Studying the renormalization group functions, we see that the beta function of the electric charge is positive and possesses no contribution coming from gravitational interaction. Our result indicates that gravitational corrections do not alter the running behavior of the gauge coupling constants, even if massive particles are present
Soft supersymmetry breaking in the nonlinear sigma model
(Elsevier, 2019-02-10) Beviláquia, Leandro Ibiapina; Lehum, A.C.; Silva, A.J.
In this work we discuss the dynamical generation of mass in a deformed supersymmetric nonlinear sigma model in a two-dimensional () space–time. We introduce the deformation by imposing a constraint that softly breaks supersymmetry. Through the tadpole method, we compute the effective potential at leading order in expansion showing that the model exhibit a dynamical generation of mass to the matter fields. Supersymmetry is recovered in the limit of the deformation parameter going to zero

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Navegando por Autor "Silva, A.J."