248 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- R. Casana71 · h 23
- M. M. Ferreira4 profiles69 · h 19
- Edilberto O. Silva3 profiles59 · h 18
- L. B. Castro3 profiles36 · h 17
- M. Schreck27 · h 19
- F. M. Andrade22 · h 17
- F. Simas21 · h 11
- A. R. Gomes20 · h 19
- C. Filgueiras19 · h 17
- E. da Hora3 profiles17 · h 5
- D. Bazeia2 profiles16 · h 40
- J. Reis2 profiles16 · h 8
- Universidade Federal da ParaíbaBR41 papers
- Universidade Estadual Paulista (Unesp)BR27 papers
- Instituto Federal do MaranhãoBR26 papers
- Universidade Federal do CearáBR24 papers
- Universidade Estadual de Ponta GrossaBR23 papers
- Universidade Federal de Campina GrandeBR21 papers
- Universidade de São PauloBR16 papers
- Universidade Federal de LavrasBR16 papers
- Universidade Federal do Espírito SantoBR16 papers
- Universidade Federal de Santa CatarinaBR15 papers
- Centro Brasileiro de Pesquisas FísicasBR14 papers
- Universidade Estadual da Região Tocantina do MaranhãoBR12 papers
25 papers · 1 filter
Kink-antikink collisions for twin models
A. R. Gomes, R. Menezes, K. Z. Nobrega +1
In this work we consider kink-antikink collisions for some classes of -dimensional nonlinear models. We are particularly interested to investigate in which aspect the presen…
On the -Dirac Oscillator revisited
F. M. Andrade, E. O. Silva, M. M. Ferreira +1
This Letter is based on the -Dirac equation, derived from the -Poincaré-Hopf algebra. It is shown that the -Dirac equation preserves parity while breaks charge conjugation…
On the effective potential, Horava-Lifshitz-like theories and finite temperature
C. F. Farias, M. Gomes, J. R. Nascimento +2
We calculate the one-loop effective potential at finite temperature for the Horava-Lifshitz-like QED and Yukawa-like theories for arbitrary values of the critical exponent and the…
Deformed self-dual magnetic monopoles
D. Bazeia, R. Casana, M. M. Ferreira +2
We develop a deformation method for attaining new magnetic monopole analytical solutions consistent with generalized Yang-Mills-Higgs model introduced recently. The new solutions f…
Self-dual soliton solutions in a Chern-Simons-CP(1) model with a nonstandard kinetic term
Rodolfo Casana, Lucas Sourrouille
A generalization of the Chern-Simons-CP(1) model is considered by introducing a nonstandard kinetic term. For a particular case, of this nonstandard kinetic term, we show that the…
A note on vortices from Lorentz-violating models
Lucas Sourrouille
We consider two self-dual abelian Higgs systems obtained from Lorentz breaking symmetry models by dimensional reduction. For the first model, we show that the self-dual equations a…
BPS Maxwell-Chern-Simons-like vortices in a Lorentz-violating framework
R. Casana, M. M. Ferreira, E. Da Hora +1
We have analyzed Maxwell-Chern-Simons-Higgs BPS vortices in a Lorentz-violating CPT-odd context. The Lorentz violation induces profiles with a conical behavior at the origin. For s…
Spin-phonon coupling in Gd(Co1/2Mn1/2)O3 perovskite
R. X. Silva, H. Reichlova, X. Marti +4
We have investigated the temperature-dependent Raman-active phonons and the magnetic properties of Gd(Co1/2Mn1/2)O3 perovskite ceramics in the temperature range from 40 K to 300 K.…
A CPT-even Lorentz-violating nonminimal coupling between fermions and photons
R. Casana, M. M. Ferreira, E. Passos F. E. P. Dos Santos +1
We propose a CPT-even and Lorentz-violating dimension-five nonminimal coupling between fermionic and gauge fields, involving the CPT-even and Lorentz-violating gauge tensor of the…
Quantum Gravity: physics from supergeometries
Diego Julio Cirilo-Lombardo, Thiago Prudencio
We show that the metric (line element) is the first geometrical object to be associated to a discrete (quantum) structure of the spacetime without necessity of black hole-entropy-a…
Trapping of Spin-0 fields on tube-like topological defects
R. Casana, A. R. Gomes, R. Menezes +1
We have considered the localization of resonant bosonic states described by a scalar field trapped in tube-like topological defects. The tubes are formed by radial symmetric de…
Synthesis and structural ordering of nano-sized Ba3B'Nb2O9 (B'= Ca and Zn) powders
João Elias Figueiredo Soares Rodrigues, Débora Morais Bezerra, Adeilton Pereira Maciel +1
In this work we investigated the phase formation and structural ordering of BaBNbO (B Ca and Zn) perovskite powders obtained by a modified polymer…
Trapping Dirac fermions in tubes generated by two scalar fields
R. Casana, A. R. Gomes, G. V. Martins +1
In this work we consider dimensional resonant Dirac fermionic states on tube-like topological defects. The defects are formed by rings in dimensions, constructed wi…
Absorption of planar massless scalar waves by Kerr black holes
Caio F. B. Macedo, Luiz C. S. Leite, Ednilton S. Oliveira +2
We consider planar massless scalar waves impinging upon a Kerr black hole, for general angles of incidence. We compute the absorption cross section via the partial wave approach, a…
Self-dual Maxwell-Chern-Simons solitons from a Lorentz-violating model
Rodolfo Casana, Lucas Sourrouille
Self-dual abelian Higgs system, involving both the Maxwell and Chern-Simons terms are obtained from Carroll-Field-Jackiw theory by dimensional reduction. Bogomol'nyi-type equations…
Some aspects of self-duality and generalised BPS theories
C. Adam, L. A. Ferreira, E. da Hora +2
If a scalar field theory in (1+1) dimensions possesses soliton solutions obeying first order BPS equations, then, in general, it is possible to find an infinite number of related f…
Weyl geometry and gauge-invariant gravitation
F. P. Poulis, J. M. Salim
We provide a gauge-invariant theory of gravitation in the context of Weyl Integrable Space-Times. After making a brief review of the theory's postulates, we carefully define the ob…
Analytical self-dual solutions in a nonstandard Yang-Mills-Higgs scenario
R. Casana, M. M. Ferreira, E. da Hora +1
We have found analytical self-dual solutions within the generalized Yang-Mills-Higgs model introduced in Phys. Rev. D 86, 085034 (2012). Such solutions are magnetic monopoles satis…
Ordering and phonons in BaCaNbO complex perovskite
João Elias Figueiredo Soares Rodrigues, Edvan Moreira, Débora Morais Bezerra +2
In this work we performed a detailed investigation about ordering in \bcn perovskite. The sintering temperature and time were changed to obtain samples with different ordering. The…
Greybody factors for non-minimally coupled scalar fields in Schwarzschild-de Sitter spacetime
Luís C. B. Crispino, Atsushi Higuchi, Ednilton S. Oliveira +1
We compute the greybody factors for non-minimally coupled scalar fields in four-dimensional Schwarzschild-de Sitter spacetime. In particular, we demonstrate that the zero-angular-m…
Remarks on the Aharonov-Casher dynamics in a CPT-odd Lorentz-violating background
E. O. Silva, F. M. Andrade
The Aharonov-Casher problem in the presence of a Lorentz-violating background nonminimally coupled to a spinor and a gauge field is examined. Using an approach based on the self-ad…
On the Aharonov-Casher scattering in a CPT-odd Lorentz-violating background
F. M. Andrade, E. O. Silva, T. Prudêncio +1
The effects of a Lorentz symmetry violating background vector on the Aharonov-Casher scattering in the nonrelativistic limit is considered. By using the self-adjoint extension meth…
Radiative generation of the CPT-even gauge term of the SME from a dimension-five nonminimal coupling term
R. Casana, M. M. Ferreira, R. V. Maluf +1
In this letter we show for the first time that the usual CPT-even gauge term of the standard model extension (SME) can be radiatively generated, in a gauge invariant level, in the…
Charged Nielsen-Olesen vortices from a Generalized Abelian Chern-Simons-Higgs Theory
Lucas Sourrouille
We consider a generalization of abelian Chern-Simons-Higgs model by introducing a nonstandard kinetic term. In particular we show that the Bogomolnyi equations of the abelian Higgs…