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Singularity-free cosmological solutions in string theories
J. C. Fabris, R. G. Furtado
Singularity-free cosmological solutions may be obtained from the string action at tree level if the dimension of the space-time is greater than 10 and if brane configurations are t…
In the Search of Singularity-Free Cosmological Models in Effective Actions
Julio C. Fabris
Fundamental theories, like strings, supergravity, Kaluza-Klein, lead after dimensional reduction and a suitable choice of field configurations, to an effective action in four dimen…
Regularity and stability of electrostatic solutions in Kaluza-Klein theory
M. Azreg-Ainou, G. Clement, C. P. Constantinidis +1
We investigate the family of electrostatic spherically symmetric solutions of the five-dimensional Kaluza-Klein theory. Besides black holes and wormholes, a new class of geodesical…
Gravitational waves in an expanding Universe
J. C. Fabris, S. V. B. Goncalves
We study the tensorial modes of the two-fluid model, where one of this fluids has an equation of state (variable cosmological constant, cosmic string fluid, texture) or…
Cold Scalar-Tensor Black Holes: Causal Structure, Geodesics, Stability
K. A. Bronnikov, G. Clement, C. P. Constantinidis +1
We study the structure and stability of spherically symmetric Brans-Dicke black-hole type solutions with an infinite horizon area and zero Hawking temperature, existing for negativ…
Cold black holes in scalar-tensor theories
K. A. Bronnikov, C. P. Constantinidis, R. L. Evangelista +1
We study the possible existence of black holes in scalar-tensor theories of gravity in four dimensions. Their existence is verified for anomalous versions of these theories, with a…