96 citations · 321 across the 15 of their papers we have counts for
6 papers · 1 filter
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…
On Clifford Subalgebras, Spacetime Splittings and Applications
Roldao da Rocha, Jayme Vaz
Z2-gradings of Clifford algebras are reviewed and we shall be concerned with an alpha-grading based on the structure of inner automorphisms, which is closely related to the spaceti…
Conservation Laws on Riemann-Cartan, Lorentzian and Teleparallel Spacetimes
Waldyr A. Rodrigues, Quintino A. G. de Souza, Roldao da Rocha
In this paper using a Clifford bundle formalism we examine (a): the strong conditions for existence of conservation laws involving only the energy-momentum and angular momentum of…
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…
The Dirac-Hestenes Equation for Spherical Symmetric Potentials in the Spherical and Cartesian Gauges
Roldao da Rocha, Waldyr A. Rodrigues
In this paper using the apparatus of the Clifford bundle formalism we show how straightforwardly solve in Minkowski spacetime the Dirac-Hestenes equation -- which is an appropriate…