6 papers
Newtonian Potential in Weyl Gravitoelectromagnetism
L. A. S. Evangelista, A. F. Santos
The gauge structure of the Weyl Gravitoelectromagnetic (GEM) formalism has been investigated, showing that although the theory admits additional propagating modes, only an effectiv…
Geometric and Statistical Thermo Field Dynamics in de Sitter Spacetime
D. S. Cabral, L. A. S. Evangelista, J. C. R. de Souza +1
The dynamics of a massive scalar field non-minimally coupled to gravity in an expanding de Sitter universe are investigated. It is shown that a comoving observer identifies the Bun…
Diffeomorphism-Like Symmetry in Gravitoelectromagnetism
L. A. S. Evangelista, A. F. Santos
Gravitoelectromagnetism in the Weyl formalism is investigated through an analysis of the consequences of a restricted gauge symmetry acting on the tensor field . The prop…
Causality and its violation in gravity
L. A. S. Evangelista, M. L. R. Silva, J. V. Moretti +1
A modified gravitational model whose action is given by an arbitrary function of the Ricci scalar, the matter Lagrangian density, a scalar field, and its kinetic term is investigat…
Gravitational Lorentz-violating scattering
L. A. S. Evangelista, A. F. Santos
We investigate the gravitational scattering process within the framework of gravitoelectromagnetism, a weak-field approximation of gravity analogous to Ma…
Thermal and Casimir effects in a Lorentz-violating massive scalar field
D. S. Cabral, L. H. A. R. Ferreira, L. A. S. Evangelista +1
In this work, a massive scalar field theory incorporating Lorentz violation is investigated. The symmetry breaking is introduced via a background traceless antisymmetric tensor. Wi…