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26 papers · 1 filter
Standard model of the rare-earths, analyzed from the Hubbard I approximation
I. L. M. Locht, Y. O. Kvashnin, D. C. M. Rodrigues +10
In this work we examine critically the electronic structure of the rare-earth elements by use of the so-called Hubbard I approximation. From the theoretical side all measured featu…
Chaotic, informational and synchronous behaviour of multiplex networks
M. S. Baptista, R. M. Szmoski, R. F. Pereira +1
The understanding of the relationship between topology and behaviour in interconnected networks would allow to characterise and predict behaviour in many real complex networks sinc…
Existence of solutions for a nonlinear Choquard equation with potential vanishing at infinity
Claudianor O. Alves, Giovany M. Figueiredo, Minbo Yang
We study the following class of nonlinear Choquard equation, $$ -Δu +V(x)u =\Big( \frac{1}{|x|^μ}\ast F(u)\Big)f(u) \quad \mbox{in} \quad \R^N, $$ where , , is…
Superradiance in static black hole spacetimes
Carolina L. Benone, Luís C. B. Crispino
We investigate the absorption of a massive and charged scalar field in a Reissner-Nordström background. We compare our numerical results for the absorption cross section, obtained…
Absorption by dirty black holes: null geodesics and scalar waves
Caio F. B. Macedo, Luiz C. S. Leite, Luís C. B. Crispino
Black holes are a paradigm in nowadays physics, and are expected to be hosted at the center of galaxies. Supermassive galactic black holes are not isolated, and their surroundings…
Regular black holes in gravity coupled to nonlinear electrodynamics
Manuel E. Rodrigues, Ednaldo L. B. Junior, Glauber T. Marques +1
We obtain a class of regular black hole solutions in four-dimensional gravity, being the curvature scalar, coupled to a nonlinear electromagnetic source. The metric form…