41 citations
7 papers
Circular Orbits in Einstein-Gauss-Bonnet Gravity
Valeria M. Rosa, Patricio S. Letelier
The stability under radial and vertical perturbations of circular orbits associated to particles orbiting a spherically symmetric center of attraction is study in the context of th…
Contact process on a Voronoi triangulation
Marcelo M. de Oliveira, S. G. Alves, S. C. Ferreira +1
We study the continuous absorbing-state phase transition in the contact process on the Voronoi-Delaunay lattice. The Voronoi construction is a natural way to introduce quenched coo…
Magnetic vortex-like excitations on a sphere
G. S. Milagre, Winder A. Moura-Melo
We study magnetic vortex-like solutions lying on the spherical surface. The simplest cylindrically symmetric vortex presents two cores (instead of one, like in open surfaces) with…
On Dirac-like Monopoles in a Lorentz- and CPT-violating Electrodynamics
N. M. Barraz, J. M. Fonseca, W. A. Moura-Melo +1
We study magnetic monopoles in a Lorentz- and CPT-odd electrodynamical framework in (3+1) dimensions. This is the standard Maxwell model extended by means of a Chern-Simons-like te…
Stability of Closed Timelike Geodesics
V. M. Rosa, P. S. Letelier
The existence and stability under linear perturbations of closed timelike geodesics (CTGs) in Bonnor-Ward spacetime is studied in some detail. Regions where the CTG exist and are l…
Stability of Closed Timelike Curves in Goedel Universe
Valeria M. Rosa, Patricio S. Letelier
We study, in some detail, the linear stability of closed timelike curves in the Goedel metric. We show that these curves are stable. We present a simple extension (deformation) of…