96 citations · 321 across the 15 of their papers we have counts for
6 papers · 1 filter
Braneworld Remarks in Riemann-Cartan Manifolds
J. M. Hoff da Silva, Roldao da Rocha
We analyze the projected effective Einstein equation in a 4-dimensional arbitrary manifold embedded in a 5-dimensional Riemann-Cartan manifold. The Israel-Darmois matching conditio…
The quadratic spinor Lagrangian, axial torsion current, and generalizations
Roldao da Rocha, J. G. Pereira
We show that the Einstein-Hilbert, the Einstein-Palatini, and the Holst actions can be derived from the Quadratic Spinor Lagrangian (QSL), when the three classes of Dirac spinor fi…
The Effective Lorentzian and Teleparallel Spacetimes Generated by a Free Electromagnetic Field
Eduardo Notte-Cuello, Roldao da Rocha, Waldyr A. Rodrigues
In this paper we show that a free electromagnetic field living in Minkowski spacetime generates an effective Weitzenbock or an effective Lorentzian spacetime whose properties arede…
Shortcuts in particle production in a toroidal compactified spacetime
Julio M. Hoff da Silva, Roldao da Rocha
We investigate the particle production in a toroidal compactified spacetime due to the expansion of a Friedmann cosmological model in R3 x S1 outside a U(1) local cosmic string. Th…
Physical Effects of Extra Dimension and Concomitant Map between Photons and Gravitons in Randall-Sundrum Brane-World Scenario
Roldao da Rocha, Carlos H Coimbra-Araujo
We investigate, in Randall-Sundrum braneworld scenario, the relationship between perturbations of gravitational and electromagnetic waves in a black hole neighboorhood, proposing a…
Conformal Klein-Gordon equations and quasinormal modes
Roldao da Rocha, E. Capelas de Oliveira
Using conformal coordinates associated with conformal relativity -- associated with de Sitter spacetime homeomorphic projection into Minkowski spacetime -- we obtain a conformal Kl…