47 citations · 393 across the 56 of their papers we have counts for
55 papers · 1 filter
Scalar fields, impurities and supersymmetry
D. Bazeia, A. C. Lehum, G. S. Santiago
We develop a rigid superspace formulation for multifield scalar models coupled to localized impurities through spurion superfields in two-dimensional spacetime.…
Perturbative Analysis of CPT-Odd Lorentz-Violating Scalar QCD
J. C. C. Felipe, L. C. T. Brito, A. C. Lehum +2
We perform a complete one-loop renormalization analysis of CPT-odd Lorentz-violating scalar quantum chromodynamics with adjoint scalar matter. Working to first order in the preferr…
Complex bumblebee model
Willian Carvalho, A. C. Lehum, J. R. Nascimento +1
We formulate a renormalizable complex extension of the bumblebee theory in which the bumblebee field is promoted to a complex one and coupled to an Abelian gauge sector. Besides th…
Half-BPS Impurity Backgrounds and Supersymmetry
D. Bazeia, A. C. Lehum
We develop a rigid superspace framework for spatially inhomogeneous impurity deformations in dimensions by embedding the impurity profile into a real b…
Scattering amplitudes in dimensionless quadratic gravity coupled to QED
I. F. Cunha, A. C. Lehum
We study ultra-Planckian scattering in an Abelian gauge theory coupled to agravity, the scale-free and renormalizable realization of quadratic quantum gravity. Focusing on…
Lorentz violating quadratic gravity
R. B. Alfaia, Willian Carvalho, A. C. Lehum +3
In this paper, we explore the perturbative renormalization and study the classical dynamics of the bumblebee model coupled to quadratic gravity, a theoretical setting that allows t…
On the physical running of the electric charge in a dimensionless theory of gravity
M. Gomes, A. C. Lehum, A. J. da Silva
We revisit the renormalization of the gauge coupling in massless QED coupled to a scaleless quadratic theory of gravity. We compare two alternative prescriptions for the running of…
Four-dimensional supersymmetric massive QED
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov
We study a four-dimensional supersymmetric Proca model with an explicit mass term for a real vector superfield and a generalized transverse kinetic operator. Althoug…
Ultra-Planckian quark and gluon scattering in agravity
I. F. Cunha, A. C. Lehum
We investigate tree-level scattering processes involving quarks () and gluons () mediated by graviton exchange in the framework of Agravity, a dimensionless and renormalizabl…
Perturbative aspects of the supersymmetric three-dimensional massive QED
A. C. Lehum, J. R. Nascimento, A. C. Pina Neto +1
We perform the study of perturbative aspects of a three-dimensional supersymmetric Maxwell-Chern-Simons-Proca theory minimally coupled to scalar superfields. Using the superfield f…
Gravitational corrections to the two-loop beta function in a non-Abelian gauge theory
M. Gomes, A. C. Lehum, A. J. da Silva
This paper investigates the coupling of massive fermions to gravity within the context of a non-Abelian gauge theory, utilizing the effective field theory framework for quantum gra…
Dynamical Lorentz Symmetry Breaking in a Scale-free Theory of Gravity
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov +1
This paper explores the renormalization of scale-free quadratic gravity coupled to the bumblebee field and its potential for dynamically breaking Lorentz symmetry. We conduct one-l…
Modified Euler-Heisenberg effective action and Proper-Time Method in Lorentz-Violating Scalar QED
L. C. T. Brito, J. C. C. Felipe, A. C. Lehum +2
Quantum photon effects in vacuum provide an interesting setting to test quantum electrodynamics, serving as a source for predictions about physics beyond the Standard Model. In thi…
One-loop corrections in Maxwell-metric-affine bumblebee gravity
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov +1
In this paper, we consider the coupling of the metric-affine bumblebee gravity to the Abelian gauge field and obtain the effective model corresponding to the weak gravity limit of…
Two-loop corrections to the Carroll-Field-Jackiw term in a CPT-odd Lorentz-violating scalar QED
A. C. Lehum, J. R. Nascimento, A. Yu. Petrov
In this study, we systematically calculate one-loop corrections to the Lorentz-violating vertices within the framework of CPT-odd Quantum Electrodynamics, encompassing scalar and p…
Two-loop renormalization of the CPT-even Lorentz-violating Scalar QED
L. C. T. Brito, J. C. C. Felipe, A. C. Lehum +1
Investigating quantum effects arising from high loops in perturbation theory is crucial for the physical applications of any quantum field theory. This paper presents a comprehensi…
Perturbative Aspects of CPT-Even Lorentz-Violating Scalar Chromodynamics
B. Altschul, L. C. T. Brito, J. C. C. Felipe +3
In this work, we formulate the theory of Lorentz-violating scalar Quantum Chromodynamics with an arbitrary non-Abelian gauge group. This theory belongs to the class of models encom…
Gravitational corrections to the Einstein-Scalar-QCD model
Huan Souza, L. Ibiapina Bevilaqua, A. C. Lehum
This study employs the effective field theory approach to quantum gravity to investigate a non-Abelian gauge theory involving scalar particles coupled to gravity. The study demonst…
On-shell supersymmetry breaking in the Abelian Chern-Simons-matter model in three dimensions of spacetime
A. C. Lehum
This study examines on-shell supersymmetry breaking in the Abelian Chern-Simons-matter model within a three-dimensional spacetime. The classical Lagrangian is scale…
Improved effective potential of Gildener-Weinberg models
Huan Souza, L. H. S. Ribeiro, A. C. Lehum
The Gildener-Weinberg models are of particular interest in the context of extensions to the Standard Model of particle physics. These extensions may encompass a variety of theories…
Three- and Four-Point Functions in CPT-Even Lorentz-Violating Scalar QED
B. Altschul, L. C. T. Brito, J. C. C. Felipe +3
The renormalization of quantum field theories usually assumes Lorentz and gauge symmetries, besides the general restrictions imposed by unitarity and causality. However, the set of…
Gravitational corrections to a non-Abelian gauge theory
Huan Souza, L. Ibiapina Bevilaqua, A. C. Lehum
This paper is part of a series of papers exploring the renormalization of field theories coupled to gravity using the effective field theory framework. In previous works we studied…
Effective potential and dynamical symmetry breaking up to five loops in a massless abelian Higgs model
A. G. Quinto, R. Vega Monroy, A. F. Ferrari +1
In this paper, we investigate the application of the Renormalization Group Equation (RGE) in the determination of the effective potential and the study of Dynamical Symmetry Breaki…
Universality of gauge coupling constant in the Einstein-QED system
L. Ibiapina Bevilaqua, A. C. Lehum, Huan Souza
In this paper we discuss the universality of the renormalization of the gauge coupling constant in the quantum electrodynamics coupled to the Einstein's gravity in the framework of…