818 research outputs found
The effect of different regulators in the non-local field-antifield quantization
Recently it was shown how to regularize the Batalin-Vilkovisky (BV)
field-antifield formalism of quantization of gauge theories with the non-local
regularization (NLR) method. The objective of this work is to make an analysis
of the behaviour of this NLR formalism, connected to the BV framework, using
two different regulators: a simple second order differential regulator and a
Fujikawa-like regulator. This analysis has been made in the light of the well
known fact that different regulators can generate different expressions for
anomalies that are related by a local couterterm, or that are equivalent after
a reparametrization. This has been done by computing precisely the anomaly of
the chiral Schwinger model.Comment: 9 pages, Revtex. To appear in Int. J. Mod. Phys.
Obtaining non-Abelian field theories via Faddeev-Jackiw symplectic formalism
In this work we have shown that it is possible to construct non-Abelian field
theories employing, in a systematic way, the Faddeev-Jackiw symplectic
formalism. This approach follows two steps. In the first step, the original
Abelian fields are modified in order to introduce the non-Abelian algebra.
After that, the Faddeev-Jackiw method is implemented and the gauge symmetry
relative to some non-Abelian symmetry group, is introduced through the
zero-mode of the symplectic matrix. We construct the SU(2) and SU(2)xU(1)
Yang-Mills theories having as starting point the U(1) Maxwell electromagnetic
theory.Comment: 6 pages. Revtex 4.
Statistical transmutation of quantum bosonic strings coupled to general four-dimensional Chern-Simons theory
A bosonic string coupled to the generalized Chern-Simons theory in 3+1D
acquires a magnetic field along itself, when it is closed, and a topological
charge at its extremity, when it is open. We construct the creation operators
for the full quantum field states associated to these strings and determine the
dual algebra satisfied by them. We show that the creation operator fo the
composite state of a quantum closed bosonic string, bearing a magnetic flux,
and a topologically charged open bosonic string, possesses generalized
statistics. The relation of our results with previous approaches to the problem
is also established.Comment: 4 pages, Revtex
Hamiltonian symplectic embedding of the massive noncommutative U(1) Theory
We show that the massive noncommutative U(1) theory is embedded in a gauge
theory using an alternative systematic way, which is based on the symplectic
framework. The embedded Hamiltonian density is obtained after a finite number
of steps in the iterative symplectic process, oppositely to the result proposed
using the BFFT formalism. This alternative formalism of embedding shows how to
get a set of dynamically equivalent embedded Hamiltonian densities.Comment: 16 pages, no figures, revtex4, corrected version, references
additione
NUMERICAL SIMULATION OF AIRFOILS APPLIED TO UAVs
This essay aims the process optimization when referred to aeronautical projects. By using mesh generators softwares and simulations made in CFD, the article employs numerical techniques to simulate airfoils and shows that is possible to extract accurated and conservative outcomes when compared to wind tunnel results. The test cases studied were based on the Selig 1223 type of airfoil and developed into the ANSYS platform, whereas by using the ICEM mesh tool, structured meshs were generated and imported to the CFX enviroment, where they could be simulated and analyzed
Gauging the SU(2) Skyrme model
In this paper the SU(2) Skyrme model will be reformulated as a gauge theory
and the hidden symmetry will be investigated and explored in the energy
spectrum computation. To this end we purpose a new constraint conversion
scheme, based on the symplectic framework with the introduction of Wess-Zumino
(WZ) terms in an unambiguous way. It is a positive feature not present on the
BFFT constraint conversion. The Dirac's procedure for the first-class
constraints is employed to quantize this gauge invariant nonlinear system and
the energy spectrum is computed. The finding out shows the power of the
symplectic gauge-invariant formalism when compared with another constraint
conversion procedures present on the literature.Comment: revised version, to appear in Phys.Rev.
Do Juiz de Paz uma análise da instituição no Estado do Espírito Santo sob a luz do acesso à justiça
Este trabalho procede à análise do processo de instituição do Juiz de Paz no Brasil a partir da Constituição Federal de 1988 intentando compreender, em última análise, os seus desdobramentos políticos, sociais e jurídicos, frente à tentativa de regulamentação da referida função no Estado do Espírito Santo. Para tanto, cumpriu-se Alcançar o entendimento democrático e as implicações ao sistema do judiciário no contexto recente do acesso à justiça. A análise da justiça de paz portuguesa, em que se buscou compreender a função do instituto em questão no ordenamento jurídico, reafirmou certos pressupostos intrínsecos à condição de desajuste que o Juiz de Paz engendra em sua relação com o magistrado e em sua atividade de implicações jurídicas distintas: celebrar casamentos e solucionar conflitos no âmbito dos métodos alternativos de resolução de conflitos. Decorre dessa relação as incongruências presentes na legislação que pretende instituí-lo nos Estados da Federação, particularmente para este trabalho, no Estado do Espírito Santo. Instrumentos jurídicos como o mandado de injunção e a construção de novos paradigmas para o ensino e a prática do Direito impõem-se, nesse contexto, como medidas capazes de trazer a efeito a desejada regulamentação para a função de Juiz de Paz no Brasil.
Palavras-chave: Juiz de Paz, Justiça de Paz, Acesso à justiça, Resolução de conflitos Civis, Magistratura brasileira, Juiz de paz no Espírito Santo
Symmetry transform in the Faddeev-Jackiw quantization of dual models
We study the presence of symmetry transformations in the Faddeev-Jackiw
approach for constrained systems. Our analysis is based in the case of a
particle submitted to a particular potential which depends on an arbitrary
function. The method is implemented in a natural way and symmetry generators
are identified. These symmetries permit us to obtain the absent elements of the
sympletic matrix which complement the set of Dirac brackets of such a theory.
The study developed here is applied in two different dual models. First, we
discuss the case of a two-dimensional oscillator interacting with an
electromagnetic potential described by a Chern-Simons term and second the
Schwarz-Sen gauge theory, in order to obtain the complete set of non-null Dirac
brackets and the correspondent Maxwell electromagnetic theory limit.Comment: 22 pages, RevTex file, no figur
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