130 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal de Minas GeraisBR58 papers
- Universidade Federal de Santa CatarinaBR17 papers
- Universidade Federal do Rio de JaneiroBR15 papers
- Laboratório Nacional de AstrofísicaBR13 papers
- Consejo Nacional de Investigaciones Científicas y TécnicasAR10 papers
- Universidade Federal dos Vales do Jequitinhonha e MucuriBR10 papers
- Universidade Federal de LavrasBR9 papers
- University of La SerenaCL8 papers
- Argentine National ObservatoryAR7 papers
- Centre National de la Recherche ScientifiqueFR7 papers
- Universidade de São PauloBR7 papers
- Universidade Federal da ParaíbaBR7 papers
19 papers · 1 filter
On the nonlinear electrodynamics in a Lorentz-breaking scenario
E. Neres Júnior, J. C. C. Felipe, A. P. Baêta Scarpelli
In this work, we study a model in nonlinear electrodynamics in the presence of a CPT-even term that violates Lorentz symmetry. The Lorentz-breaking vector, in addition to the usual…
The full Lorentz-violating vacuum polarization tensor: low and high energy limits
J. C. C. Felipe, A. Yu. Petrov, A. P. Baêta Scarpelli +1
We compute the full vacuum polarization tensor in the fermion sector of Lorentz-violating QED. Even if we assume momentum routing invariance of the Feynman diagrams, it is not poss…
Calculations in Lorentz-breaking scalar QED
Jean C. C. Felipe, A. Yu Petrov, A. P. B. Scarpelli +1
We purpose a study a Lorentz-breaking extension of the scalar QED. We calculate the contributions in the Lorentz-violating parameters to the two-point functions of scalar and gauge…
Advances towards the systematization of calculations with Implicit Regularization
B. Z. Felippe, A. P. Baêta Scarpelli, A. R. Vieira +1
There is currently a high demand for theoretical predictions for processes at next-to-next-to-leading order (NNLO) and beyond, mainly due to the large amount of data which has alre…
One-loop calculations in CPT-even Lorentz-breaking scalar QED
A. P. Baêta Scarpelli, J. C. C. Felipe, L. C. T. Brito +1
In this paper, we study a CPT-even Lorentz-breaking extension of the scalar QED. For this theory, we calculate the one-loop lower-order contributions in the Lorentz-violating param…
Residual gauge-invariance in a massive Lorentz-violating extension of QED
B. Alves Marques, A. P. Baêta Scarpelli, J. C. C. Felipe +1
We reassess an alternative CPT-odd electrodynamics obtained from a Palatini-like procedure. Starting from a more general situation, we analyze the physical consistency of the model…
No radiative corrections to the Carroll-Field-Jackiw term beyond one-loop order
L. C. T. Brito, J. C. C. Felipe, A. Yu. Petrov +1
We demonstrate explicitly the absence of the quantum corrections to the Carroll-Field-Jackiw (CFJ) term beyond one-loop within the Lorentz-breaking CPT-odd extension of QED. The pr…
The Exact Foldy-Wouthuysen Transformation for a Dirac Theory Revisited
Bruno Gonçalves, Mário M. Dias Júnior, Baltazar J. Ribeiro
The Exact Foldy-Wouthuysen transformation (EFWT) method is generalized here. In principle, it is not possible to construct the EFWT to any Hamiltonian. The transformation condition…
Consistency of an alternative CPT-odd and Lorentz-violating extension of QED
J. C. C. Felipe, H. G. Fargnoli, A. P. Baeta Scarpelli +1
We investigate an alternative CPT-odd Lorentz-breaking QED which includes the Carroll-Field-Jackiw (CFJ) term of the Standard Model Extension (SME), writing the gauge sector in the…
Effective potential in Lorentz-breaking field theory models
A. P. Baeta Scarpelli, L. C. T. Brito, J. C. C. Felipe +2
We calculate explicitly the one-loop effective potential in different Lorentz-breaking field theory models. First, we consider a Yukawa-like theory and, then, some examples of Lore…
The space-time torsion in the context of the Exact Foldy-Wouthuysen Transformation for a Dirac fermion
Bruno Goncalves, Baltazar Jonas Ribeiro Morais, Dante Donizeti Pereira +1
In this work we focus our attention in the inconsistency that appears when the Semi-Exact Foldy-Wouthuysen transformation for the Dirac field interacting with space-time torsion fi…
The Exact Foldy-Wouthuysen Transformation for a Dirac Theory with the complete set of CPT-Lorentz violating terms
Bruno Gonçalves, Mário M. Dias Júnior, Baltazar J. Ribeiro
The exact Foldy-Wouthuysen transformation is performed in order to study the Dirac field interacting with many possible external fields associated with CPT-Lorentz violation. We al…
Multiloop calculations with Implicit Regularization in massless theories
E. W. Dias, A. P. Baeta Scarpelli, L. C. T. Brito +1
We establish a systematic way to calculate multiloop amplitudes of infrared safe massless models with Implicit Regularization (IR), with a direct cancelation of the fictitious mass…
Systematization of Basic Divergent Integrals in Perturbation Theory and Renormalization Group Functions
L. C. T. Brito, H. G. Fargnoli, A. P. Baêta Scarpelli +2
We show that to n loop order the divergent content of a Feynman amplitude is spanned by a set of basic (logarithmically divergent) integrals which need not be evaluated. Only the c…
Gauge invariance and the CPT and Lorentz violating induced Chern-Simons-like term in extended QED
A. P. Baeta Scarpelli, Marcos Sampaio, M. C. Nemes +1
The radiative induction of the CPT and Lorentz violating Chern-Simons (CS) term is reassessed. The massless and massive models are studied. Special attention is given to the preser…
Implicit regularization beyond one loop order: gauge field theories
E. W. Dias, A. P. Baeta Scarpelli, L. C. T. Brito +2
We extend a constrained version of Implicit Regularization (CIR) beyond one loop order for gauge field theories. In this framework, the ultraviolet content of the model is displaye…
On the equivalence between Implicit Regularization and Constrained Differential Renormalization
Carlos R. Pontes, A. P. Baêta Scarpelli, Marcos Sampaio +2
Constrained Differential Renormalization (CDR) and the constrained version of Implicit Regularization (IR) are two regularization independent techniques that do not rely on dimensi…
Implicit regularization beyond one loop order: scalar field theories
C. R. Pontes, A. P. Baeta Scarpelli, Marcos Sampaio +1
Implicit regularization (IR) has been shown as an useful momentum space tool for perturbative calculations in dimension specific theories, such as chiral gauge, topological and sup…
Microlocal Analysis and Renormalization in Finite Temperature Field Theory
D. H. T. Franco, J. L. Acebal
We reassess the problem of renormalization in finite temperature field theory (FTFT). A new point of view elucidates the relation between the ultraviolet divergences for T=0 and $T…