48 citations · 303 across the 21 of their papers we have counts for
21 papers
Quantum Cosmology of Fab Four John Theory with Conformable Fractional Derivative
Isaac Torres, Júlio César Fabris, Oliver Fabio Piattella +1
We study a quantization via fractional derivative of a nonminimal derivative coupling cosmological theory, namely, the Fab Four John theory. Its Hamiltonian version presents the is…
Cosmological scenarios in quantum cosmology of Brans-Dicke theory of gravity on Einstein and Jordan frames
Carla Rodrigues Almeida, Antônio Brasil Batista, Júlio César Fabris +1
The Hamiltonian of any quantum cosmological model must obey some conditions in order to be self-adjoint, or to admit self-adjoint extensions. We will consider in this paper the sel…
Quantum cosmology of scalar-tensor theories and self-adjointness
C. R. Almeida, A. B. Batista, J. C. Fabris +1
In this paper, the problem of the self-adjointness for the case of a quantum minisuperspace Hamiltonian retrieved from a Brans-Dicke (BD) action is investigated. Our matter content…
Quantum cosmology with scalar fields: self-adjointness and cosmological scenarios
C. R. Almeida, A. B. Batista, J. C. Fabris +1
We discuss the issue of unitarity in particular quantum cosmological models with scalar field. The time variable is recovered, in this context, by using the Schutz's formalism for…
Quantum effects near future singularities
John D. Barrow, Antonio B. Batista, Giuseppe Dito +2
General relativity allows a variety of future singularities to occur in the evolution of the universe. At these future singularities, the universe will end in a singular state afte…
Sudden singularities survive massive quantum particle production
J. D. Barrow, A. B. Batista, G. Dito +2
We solve the Klein-Gordon equation for a massive, non-minimally coupled scalar field, with a conformal coupling, undergoing cosmological evolution from a radiation-dominated phase…