96 citations · 321 across the 15 of their papers we have counts for
9 papers · 1 filter
The Einstein-Hilbert Lagrangian Density in a 2-dimensional Spacetime is an Exact Differential
Roldao da Rocha, W. A. Rodrigues
Recently Kiriushcheva and Kuzmin claimed to have shown that the Einstein-Hilbert Lagrangian cannot be written in any coordinate gauge as an exact differential in a 2-dimensional sp…
Diffeomorphism Invariance and Local Lorentz Invariance
Roldao da Rocha, Waldyr A. Rodrigues
We show that diffeomorphism invariance of the Maxwell and the Dirac-Hestenes equations implies the equivalence among different universe models such that if one has a linear connect…
Could the variation in quasar luminosity, due to extra dimension 3-brane in RS model, be measurable?
Roldao da Rocha, Carlos H. Coimbra-Araujo
We propose an alternative theoretical approach showing how the existence of an extra dimension in RS model can estimate the correction in the Schwarzschild radius of black holes, a…
Where are ELKO Spinor Fields in Lounesto Spinor Field Classification?
Roldao da Rocha, Waldyr Alves Rodrigues
This paper proves that from the algebraic point of view ELKO spinor fields belong together with Majorana spinor fields to a wider class of spinor fields, the so-called flagpole spi…
Anti-de Sitter curvature radius constrained by quasars in brane-world scenarios
Carlos H. Coimbra-Araujo, Roldao da Rocha, I. T. Pedron
This paper is intended to investigate the luminosity due to accretion of gas in supermassive black holes (SMBHs) in the center of quasars, using a brane-world scenario naturally en…
Spacetime Deformations and Electromagnetism in Material Media
R. da Rocha, I. L. Freire
This paper is intended to investigate the relation between electrodynamics in anisotropic material media and its analogous formulation in an spacetime, with non-null Riemann curvat…