136 citations · 544 across the 32 of their papers we have counts for
29 papers · 1 filter
Aether field coupled to the electromagnetic field in the TFD formalism
R. Corrêa, L. H. A. R. Ferreira, A. F. Santos +1
In this paper, the aether field, which leads to the violation of Lorentz symmetries, coupled with the electromagnetic field is considered. In order to study thermal and size effect…
A Quasi Self-Dual Skyrme Model
L. A. Ferreira, L. R. Livramento
It has been recently proposed a modification of the Skyrme model which admits an exact self-dual sector by the introduction of six scalar fields assembled in a symmetric, positive…
TFD formalism: applications to the scalar field in a Lorentz-violating theory
L. H. A. R. Ferreira, A. F. Santos, Faqir C. Khanna
The Thermofield Dynamics (TFD) formalism is considered. In this context, a Lorentz-breaking scalar field theory is introduced. In contrast to the Matsubara formalism, the best-know…
A Generalised Self-Duality for the Yang-Mills-Higgs System
L. A. Ferreira, H. Malavazzi
Self-duality is a very important concept in the study and applications of topological solitons in many areas of Physics. The rich mathematical structures underlying it lead, in man…
Self-Duality in the Context of the Skyrme Model
L. A. Ferreira, L. R. Livramento
We study a recently proposed modification of the Skyrme model that possesses an exact self-dual sector leading to an infinity of exact Skyrmion solutions with arbitrary topological…
Self-dual sectors for scalar field theories in (1 + 1) dimensions
L. A. Ferreira, P. Klimas, Wojtek J. Zakrzewski
We use ideas of generalized self-duality conditions to construct real scalar field theories in (1 + 1)-dimensions with exact self dual sectors. The approach is based on a pre-poten…
Some Comments on BPS systems
L. A. Ferreira, P. Klimas, A. Wereszczynski +1
We look at simple BPS systems involving more than one field. We discuss the conditions that have to be imposed on various terms in Lagrangians involving many fields to produce BPS…
A direct test of the integral Yang-Mills equations through SU(2) monopoles
C. P. Constantinidis, L. A. Ferreira, G. Luchini
We use the SU(2) 't Hooft-Polyakov monopole configuration, and its BPS version, to test the integral equations of the Yang-Mills theory. Those integral equations involve two (compl…
Exact self-duality in a modified Skyrme model
L. A. Ferreira
We propose a modification of the Skyrme model that supports a self-dual sector possessing exact non-trivial finite energy solutions. The action of such a theory possesses the usual…
Exact Self-Dual Skyrmions
L. A. Ferreira, Ya. Shnir
We introduce a Skyrme type model with the target space being the 3-sphere S^3 and with an action possessing, as usual, quadratic and quartic terms in field derivatives. The novel c…
A Skyrme-like model with an exact BPS bound
L. A. Ferreira, Wojtek J. Zakrzewski
We propose a new Skyrme-like model with fields taking values on the sphere S^3 or, equivalently, on the group SU(2). The action of the model contains a quadratic kinetic term plus…
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…
An integral formulation of Yang-Mills on loop space
L. A. Ferreira, G. Luchini
It is proposed an integral formulation of classical Yang-Mills equations in the presence of sources, based on concepts in loop spaces and on a generalization of the non-abelian Sto…
Some (3+1) dimensional vortex solutions of the CPN model
L. A. Ferreira, P. Klimas, W. J. Zakrzewski
We present a class of solutions of the CPN model in (3+1) dimensions. We suggest that they represent vortex-like configurations. We also discuss some of their properties. We show t…
Self-dual Hopfions
L. A. Ferreira, A. C. Riserio do Bonfim
We construct static and time-dependent exact soliton solutions with non-trivial Hopf topological charge for a field theory in 3+1 dimensions with the target space being the two dim…
Dynamics of the topological structures in inhomogeneous media
L. A. Ferreira, B. Piette, W. J. Zakrzewski
We present a general review of the dynamics of topological solitons in 1 and 2 dimensions and then discuss some recent work on the scattering of various solitonic objects (such as…
The Bullough-Dodd model coupled to matter fields
P. E. G. Assis, L. A. Ferreira
The Bullough-Dodd model is an important two dimensional integrable field theory which finds applications in physics and geometry. We consider a conformally invariant extension of i…
Spinning Hopf solitons on S^3 x R
A. C. Riserio do Bonfim, L. A. Ferreira
We consider a field theory with target space being the two dimensional sphere S^2 and defined on the space-time S^3 x R. The Lagrangean is the square of the pull-back of the area f…
Exact time dependent Hopf solitons in 3+1 dimensions
L. A. Ferreira
We construct an infinite number of exact time dependent soliton solutions, carrying non-trivial Hopf topological charges, in a 3+1 dimensional Lorentz invariant theory with target…
A model for Hopfions on the space-time S^3 x R
E. De Carli, L. A. Ferreira
We construct static and time dependent exact soliton solutions for a theory of scalar fields taking values on a wide class of two dimensional target spaces, and defined on the four…
Euclidean 4d exact solitons in a Skyrme type model
L. A. Ferreira
We introduce a Skyrme type, four dimensional Euclidean field theory made of a triplet of scalar fields n, taking values on the sphere S^2, and an additional real scalar field phi,…
On the connections between Skyrme and Yang Mills theories
Joaquin Sanchez-Guillen, L. A. Ferreira
Skyrme theories on S^3 and S^2, are analyzed using the generalized zero curvature in any dimensions. In the first case, new symmetries and integrable sectors, including the B =1 sk…
Integrability and Conformal Symmetry in Higher Dimensions: A Model with Exact Hopfion Solutions
O. Babelon, L. A. Ferreira
We use ideas on integrability in higher dimensions to define Lorentz invariant field theories with an infinite number of local conserved currents. The models considered have a two…
Hopf solitons and area preserving diffeomorphisms of the sphere
L. A. Ferreira, A. V. Razumov
We consider a (3+1)-dimensional local field theory defined on the sphere. The model possesses exact soliton solutions with non trivial Hopf topological charges, and infinite number…