32 citations · 119 across the 12 of their papers we have counts for
12 papers
Dynamical systems analysis of unimodular cosmology in dimensions
A. M. Velásquez-Toribio, J. C. Fabris
We investigate the effective four-dimensional cosmology induced by unimodular gravity in dimensions, where the internal extra-dimensional volume is encoded in a scalar degr…
Perturbative analysis of singularity-free cosmological solutions in unimodular Kaluza-Klein theory
J. C. Fabris, S. Faller, R. Kerner
The unimodular version of the Kaluza-Klein theory is briefly recalled, and its projection on the -dimensional spacetime is constructed. Imposing unimodularity condition on the $…
A Five-dimensional Kaluza-Klein Approach to Unimodular Gravity
Júlio C. Fabris, Richard Kerner
In this article we present a possibility of imposing the unimodular condition within the 5-dimensional Kaluza-Klein theory including the scalar field. Unimodular gravity became an…
On the Stability of Non-Singular Solutions in Effective Theory from Kaluza-Klein Unimodular Gravity
Júlio C. Fabris, Richard Kerner
Unimodular theory incorporating the Kaluza-Klein construction in five dimensions leads, after reduction to four dimensions, to a new class of scalar-tensor theory. The vacuum cosmo…
Dark sector interactions in light of weak lensing data
M. Benetti, P. T. Z. Seidel, C. Pigozzo +3
The current observational tensions in the standard cosmological model have reinforced the research on dynamical dark energy, in particular on models with non-gravitational interact…
A unimodular Kaluza-Klein theory
Júlio C. Fabris, Richard Kerner
Unimodular gravity became an object of increasing interest in the late -ties and was recently used in primordial Universe modeling with cosmological constant, in the context of…
Non-adiabatic perturbations in decaying vacuum cosmology
W. Zimdahl, H. A. Borges, S. Carneiro +2
We investigate a spatially flat Friedmann-Lemaître-Robertson-Walker cosmology in which a decaying vacuum term causes matter production at late times. Assuming a decay proportional…
Nonsingular multidimensional cosmologies without fine tuning
K. A. Bronnikov, J. C. Fabris
Exact cosmological solutions for effective actions in D dimensions inspired by the tree-level superstring action are studied. For a certain range of free parameters existing in the…
Quantum cosmological perfect fluid model and its classical analogue
A. B. Batista, J. C. Fabris, S. V. B. Goncalves +1
The quantization of gravity coupled to a perfect fluid model leads to a Schrödinger-like equation, where the matter variable plays the role of time. The wave function can be determ…
Classical analogous of quantum cosmological perfect fluid models
A. B. Batista, J. C. Fabris, S. V. B. Goncalves +1
Quantization in the mini-superspace of a gravity system coupled to a perfect fluid, leads to a solvable model which implies singularity free solutions through the construction of a…
Electrostatic solutions in Kaluza-Klein theory: geometry and stability
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. Both charged and neutral cases are considered. The analysis…
Perturbative analysis of generalized Einstein's theories
J. C. Fabris, R. Kerner, J. Tossa
The hypothesis that the energy-momentum tensor of ordinary matter is not conserved separately, leads to a non-adiabatic expansion and, in many cases, to an Universe older than usua…