99 citations · 466 across the 20 of their papers we have counts for
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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…
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…
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…
Tree-level equivalence between a Lorentz-violating extension of QED and its dual model in electron-electron scattering
Giuliano R. Toniolo, H. G. Fargnoli, L. C. T. Brito +1
S-matrix amplitudes for the electron-electron scattering are calculated in order to verify the quantum equivalence of dual models. We used an extended Quantum Electrodynamics with…
Remarks on a Lorentz-breaking 4D chiral gauge theory
A. P. Baêta Scarpelli, M. Gomes, A. Yu. Petrov +1
We investigate a Lorentz-violating chiral model composed by two fermions, a complex scalar field and a gauge field. We show that by convenientely adjusting the parameters of the mo…
Subtleties in the beta function calculation of N=1 supersymmetric gauge theories
A. L. Cherchiglia, Marcos Sampaio, B. Hiller +1
We investigate some peculiarities in the calculation of the two-loop beta-function of supersymmetric models which are intimately related to the so-called "Anomaly Puzzle". Th…
On the anomalies in Lorentz-breaking theories
A. P. Baeta Scarpelli, T. Mariz, J. R. Nascimento +1
In this paper, we discuss the chiral anomaly in a Lorentz-breaking extension of QED which, besides the common terms that are present in the Standard Model Extension, includes some…
On the duality in CPT-even Lorentz-breaking theories
A. P. Baeta Scarpelli, J. R. Nascimento, A. Yu. Petrov +1
In this paper, we generalize the duality between self-dual and Maxwell-Chern-Simons theories for the case of a CPT-even Lorentz-breaking extension of these theories. The duality is…
Dual embedding of extended models with a Lorentz-breaking mass term
H. G. Fargnoli, L. C. T. Brito, A. P. Baêta Scarpelli +1
In this paper, we investigate a CPT-even model with a Lorentz-violating mass term. Such kind of models may present very interesting features like superluminal modes of propagation…
Aspects of Quantum Corrections in a Lorentz-violating Extension of the Abelian Higgs Model
L. C. T. Brito, H. G. Fargnoli, A. P. Baêta Scarpelli
We investigate new aspects related to the abelian gauge-Higgs model with the addition of the Carroll-Field-Jackiw term. We focus on one-loop quantum corrections to the photon and H…
Four-dimensional aether-like Lorentz-breaking QED revisited and problem of ambiguities
A. P. Baeta Scarpelli, T. Mariz, J. R. Nascimento +1
In this paper, we consider the perturbative generation of the CPT-even aether-like Lorentz-breaking term in the extended Lorentz-breaking QED within different approaches and discus…
QED with minimal and nonminimal couplings: on the quantum generation of Lorentz violating terms in the pure photon sector
G. Gazzola, H. G. Fargnoli, A. P. Baêta Scarpelli +2
We consider an effective model formed by usual QED (minimal coupling) with the addition of a nonminimal Lorentz violating interaction (proportional to a fixed 4-vector ) which…
Regularization Independent Analysis of the Origin of Two Loop Contributions to N=1 Super Yang-Mills Beta Function
H. G. Fargnoli, B. Hiller, A. P. Baêta Scarpelli +2
We present a both ultraviolet and infrared regularization independent analysis in a symmetry preserving framework for the N=1 Super Yang-Mills beta function to two loop order. We s…
Ultraviolet and Infrared Divergences in Implicit Regularization: a Consistent Approach
H. G. Fargnoli, A. P. Baeta Scarpelli, L. C. T. Brito +4
Implicit Regularization is a 4-dimensional regularization initially conceived to treat ultraviolet divergences. It has been successfully tested in several instances in the literatu…
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…
Dual embedding of the Lorentz-violating electrodinamics and Batalin-Vilkovisky quantization
M. Botta Cantcheff, C. F. L. Godinho, A. P. Baêta Scarpelli +1
Modifications of the electromagnetic Maxwell Lagrangian in four dimensions have been considered by some authors. One may include an explicit massive term (Proca) and a topological…
Aspects of Causality and Unitarity and Comments on Vortex-like Configurations in an Abelian Model with a Lorentz-Breaking Term
A. P. Baeta Scarpelli, H. Belich, J. L. Boldo +1
The gauge-invariant Chern-Simons-type Lorentz- and CPT-breaking term is here reassessed and a spin-projector method is adopted to account for the breaking (vector) parameter. Issue…
Comparing Implicit, Differential, Dimensional and BPHZ Renormalisation
M. Sampaio, A. P. Baeta Scarpelli, B. Hiller +3
We compare a momentum space implicit regularisation (IR) framework with other renormalisation methods which may be applied to dimension specific theories, namely Differential Renor…