61 citations · 175 across the 12 of their papers we have counts for
12 papers
On the intrinsically flat cosmological models in a lattice
Eduardo Bittencourt, Leandro G. Gomes, Grasiele B. Santos
In this manuscript we investigate the intrinsically flat (space-flat) spacetimes as viable cosmological models. We show that they have a natural geometric structure which is suitab…
Thermal dimensional reduction and black hole evaporation
I. P. Lobo, G. B. Santos
We analyze how a quantum-gravity-induced change in the number of thermal dimensions (through a modified dispersion relation) affects the geometry and the thermodynamics of a charge…
Intrinsically symmetric cosmological model in the presence of dissipative fluids
E. Bittencourt, L. G. Gomes, G. B. Santos
Based upon the intrinsic symmetries approach to inhomogeneous cosmologies, we propose an exact solution to Einstein's field equations where the spatial sections are flat and the so…
Radiating Spherical Collapse for an Inhomogeneous Interior Solution
Eduardo Bittencourt, Vanessa P Freitas, José M Salim +1
We analyze the problem of gravitational collapse considering the matching of an exterior region described by the Vaidya's metric and an interior region described by a spherically s…
Dynamical Wormhole Definitions Confronted
E. Bittencourt, R. Klippert, G. B. Santos
Crude comparison between four alternative proposals for the very definition of a wormhole is provided, all of which were intended to apply to the dynamical cases. An interesting dy…
Thermal dimension of quantum spacetime
Giovanni Amelino-Camelia, Francesco Brighenti, Giulia Gubitosi +1
Recent results suggest that a crucial crossroad for quantum gravity is the characterization of the effective dimension of spacetime at short distances, where quantum properties of…
On the initial singularity problem in rainbow cosmology
Grasiele Santos, Giulia Gubitosi, Giovanni Amelino-Camelia
It has been recently claimed that the initial singularity might be avoided in the context of rainbow cosmology, where one attempts to account for quantum-gravitational corrections…
Magnetic fields and the Weyl tensor in the early universe
Eduardo Bittencourt, José Salim, Grasiele B. dos Santos
We have solved the Einstein-Maxwell equations for a class of isotropic metrics with constant spatial curvature in the presence of magnetic fields. We consider a slight modification…
Quantum-to-classical transition of primordial cosmological perturbations in de Broglie-Bohm quantum theory: the bouncing scenario
N. Pinto-Neto, G. B. Santos, W. Struyve
In a previous work we have exhibited a clear description of the quantum-to-classical transition of cosmological quantum fluctuations in the inflationary scenario using the de Brogl…
Consistent Probabilities in Perfect Fluid Quantum Universes
Clécio R. Bom, Nelson Pinto-Neto, Grasiele B. Santos
Recently it has been claimed that the Wheeler-DeWitt quantization of gravity is unable to avoid cosmological singularities. However, in order to make this assertion, one must speci…
Scalar perturbations in a Friedmann-like metric with non-null Weyl tensor
Grasiele B. Santos, Eduardo Bittencourt, José M. Salim
In a previous work the authors have solved the Einstein equations of General Relativity for a class of metrics with constant spatial curvature, where it was found a non vanishing W…
Quantum-to-classical transition of primordial cosmological perturbations in de Broglie--Bohm quantum theory
Nelson Pinto-Neto, Grasiele Santos, Ward Struyve
There is a widespread belief that the classical small inhomogeneities which gave rise to all structures in the Universe through gravitational instability originated from primordial…