3 citations · 6 across the 4 of their papers we have counts for
5 papers · 1 filter
Quantum modes around a scalar-tensor black hole: breakdown of the normalization conditions
F. G. Alvarenga, A. B. Batista, J. C. Fabris +1
Black holes arising in the context of scalar-tensor gravity theories, where the scalar field is non-minimally coupled to the curvature term, have zero surface gravity. Hence, it is…
Troubles with quantum anisotropic cosmological models: loss of unitarity
F. G. Alvarenga, A. B. Batista, J. C. Fabris +1
The anisotropic Bianchi I cosmological model coupled with perfect fluid is quantized in the minisuperspace. The perfect fluid is described by using the Schutz formalism which allow…
Zero temperature black holes and the failure of semi-classical analysis
F. G. Alvarenga, A. B. Batista, J. C. Fabris +1
The extreme Reissner-Nordström black holes have zero surface gravity. However, a semi-classical analysis seems to be ill-definite for these objects and apparently no notion of temp…
Dark energy, dark matter and the Chaplygin gas
R. Colistete, J. C. Fabris, S. V. B. Goncalves +1
The possibility that the dark energy may be described by the Chaplygin gas is discussed. Some observational constraints are established. These observational constraints indicate th…
Anisotropic quantum cosmological models: a discrepancy between many-worlds and dBB interpretations
F. G. Alvarenga, A. B. Batista, J. C. Fabris +1
In the isotropic quantum cosmological perfect fluid model, the initial singularity can be avoided, while the classical behaviour is recovered asymptotically. We verify if initial a…