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4 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…
Static charged fluid around a massive magnetic dipole
Jose D. Polanco, Patricio S. Letelier, Maximiliano Ujevic
An analytical solution of Einstein-Maxwell equations with a static fluid as a source is presented. The spacetime is represented by the axially symmetric Weyl metric and the energy-…
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…
A mathematical analysis of the evolution of perturbations in a modified Chaplygin gas model
Sandro Silva e Costa, Maximiliano Ujevic, Alesandro Ferreira dos Santos
One approach in modern cosmology consists in supposing that dark matter and dark energy are different manifestations of a single `quartessential' fluid. Following such idea, this w…