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Aspects of causality and unitarity and comments on vortexlike configurations in an Abelian model with a Lorentz-breaking term

- A. Scarpelli, H. Belich, J. L. Boldo, J. Helayel-Neto
- Physics
- 26 April 2002

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. Issues like causality,… Expand

Dual embedding of the Lorentz-violating electrodinamics and Batalin-Vilkovisky quantization

- M. B. Cantcheff, C. Godinho, A. Scarpelli, J. Helayel-Neto
- Physics
- 10 April 2003

Modifications of the electromagnetic Maxwell Lagrangian in four dimensions have been considered by some authors [1]. One may include an explicit massive term (Proca) and a topological but not… Expand

Remarks on Dirac-like monopoles, Maxwell and Maxwell-Chern-Simons electrodynamics in D=2+1 dimensions

- W. A. Moura-Melo, J. Helayel-Neto
- Physics
- 19 April 2000

Classical Maxwell and Maxwell-Chern-Simons (MCS) Electrodynamics in (2+1)D are studied in some details. General expressions for the potential and fields are obtained for both models, and some… Expand

Variational approach and deformed derivatives

- J. Weberszpil, J. Helayel-Neto
- Mathematics, Physics
- 9 November 2015

Recently, we have demonstrated that there exists a possible relationship between q-deformed algebras in two different contexts of Statistical Mechanics, namely, the Tsallis’ framework and the… Expand

Structural scale $q-$derivative and the LLG-Equation in a scenario with fractionality

- J. Weberszpil, J. Helayel-Neto
- Physics, Mathematics
- 27 January 2017

In the present contribution, we study the Landau-Lifshitz-Gilbert equation with two versions of structural derivatives recently proposed: the scale $q-$derivative in the non-extensive statistical… Expand

Superpropagators for explicitly broken supersymmetric theories

- J. L. Boldo, L. Colatto, M. A. Andrade, O. M. D. Cima, J. Helayel-Neto
- Physics
- 2 February 1984

A systematic algorithm to derive superpropagators in the case of either explicitly or spontaneously broken supersymmetric three-dimensional theories is presented. We discuss how the explicit breaking… Expand

The origin of Chern-Simons modified gravity from an 11 + 3-dimensional manifold

- J. Helayel-Neto, A. Sepehri
- Physics
- 13 January 2017

It is our aim to show that the Chern-Simons terms of modified gravity can be understood as generated by the addition of a 3-dimensional algebraic manifold to an initial 11-dimensional space-time… Expand

Upper bounds on the photon mass

- A. Accioly, J. Helayel-Neto, E. Scatena
- Physics
- 24 September 2010

The effects of a nonzero photon rest mass can be incorporated into electromagnetism in a simple way using the Proca equations. In this vein, two interesting implications regarding the possible… Expand

Comparative aspects of spin-dependent interaction potentials for spin-1/2 and spin-1 matter fields

- P. C. Malta, L. Ospedal, K. Veiga, J. Helayel-Neto
- Physics
- 12 October 2015

This paper sets out to establish a comparative study between classes of spin- and velocity-dependent potentials for spin-1/2 and spin-1 matter currents/sources in the non-relativistic regime. Both… Expand

Effective photon mass by Super and Lorentz symmetry breaking

- Luca Bonetti, L. R. D. S. Filho, J. Helayel-Neto, A. Spallicci
- Physics
- 29 July 2016

In the context of Standard Model Extensions (SMEs), we analyse four general classes of Super Symmetry (SuSy) and Lorentz Symmetry (LoSy) breaking, leading to observable imprints at our energy scales.… Expand

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