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- Valongo ObservatoryBR70 papers
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4 papers · 1 filter
Electrically charged fluids with pressure in Newtonian gravitation and general relativity in d spacetime dimensions: theorems and results for Weyl type systems
José P. S. Lemos, Vilson T. Zanchin
Previous theorems concerning Weyl type systems, including Majumdar-Papapetrou systems, are generalized in two ways, namely, we take these theorems into d spacetime dimensions (${\r…
Stable and "bounded excursion" gravastars, and black holes in Einstein's theory of gravity
P. Rocha, R. Chan, M. F. A. da Silva +1
Dynamical models of prototype gravastars are constructed and studied. The models are the Visser-Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of a p…
Gravitational Collapse of a Massless Scalar Field and a Perfect Fluid with Self-Similarity of the First Kind in (2+1) Dimensions
F. I. M. Pereira, R. Chan
Self-similar solutions of a collapsing perfect fluid and a massless scalar field with kinematic self-similarity of the first kind in 2+1 dimensions are obtained. Their local and gl…
Gravitational magnetic monopoles and Majumdar-Papapetrou stars
Jose' P. S. Lemos, Vilson T. Zanchin
A large amount of work has been dedicated to studying general relativity coupled to non-Abelian Yang-Mills type theories. It has been shown that the magnetic monopole, a solution o…