Yang Mills Fields
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Instantons in curved spaces / Instantons em espaços curvos
In this work we study instanton solutions of the Yang-Mills theory in Schwarzschild and Reissner-Nordstrom spaces with gauge group SU(2).Instantons are solutions to the classical field equations of Yang-Mills theory defined in a space with Riemannian (positive de finite)metric with finite action. We begin with a review of the geometric setting of Yang-Mills
Publicado em: 2010
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2. Aspectos não perturbativos das teorias de Yang-Mills no calibre abeliano maximal / Non-perturbative aspects of the Yang-Mills theories in the maximal Albelian gauge
In this, we study the nonperturbative effects associated to the presence of the horizon and to the condensation of local dimension two operators in an Eucledean SU(2)Yang-Mills theory quantized in the maximal Abelian gauge. Such effects are introduced in a way to preserve the properties of renormalizability and locality of the theory. The comparison with the
Publicado em: 2009
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3. The chromo-weibel instability
I discuss the physics of non-Abelian plasmas which are locally anisotropic in momentum space. Such momentum-space anisotropies are generated by the rapid longitudinal expansion of the matter created in the first 1 fm/c of an ultrarelativistic heavy ion collision. In contrast to locally isotropic plasmas anisotropic plasmas have a spectrum of soft unstable mo
Braz. J. Phys.. Publicado em: 2007-06
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4. From confining fields on the lattice to higher dimensions in the continuum
We discuss the relation between lattice phenomenology of confining fields in the vacuum state of Yang-Mills theories (mostly SU(2) case) and continuum theories. In the continuum, understanding of the confinement is most straightforward in the dual formulation which involves higher dimensions. We try to bridge these two approaches to the confinement, let it b
Brazilian Journal of Physics. Publicado em: 2007-03
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5. A local non-Abelian gauge invariant action stemming from the nonlocal operator FmuN(D²)-1FmuN
We report on the nonlocal gauge invariant operator of dimension two, FµN (D²)-1 FµN. We are able to localize this operator by introducing a suitable set of (anti)commuting antisymmetric tensor fields. Starting from this, we succeed in constructing a local gauge invariant action containing a mass parameter, and we prove the renormalizability to all orders
Brazilian Journal of Physics. Publicado em: 2007-03
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6. Tratamento das equações de Eintein-Yang-Mills para soluções numericas com simetria esferica auto-gravitante e simetria axial no espaço-tempo de Minkowski / Set up of Einstein-Yang-Mills equation for numerical solutions of self-gravitating spherical symmetric fields and axial simmetric fields on Minkowski space-time
Nesse trabalho delineamos a teoria clássica para o campo de Einstein-Yang-Mills e elaboramos um conjunto particular de equações para obtermos soluções numéricas. Estudamos dois casos com simetria espaço-temporal: Simetria esférica com campo auto-gravitante e simetria axial no espaço-tempo de Minkowski. Utilizamos métodos numéricos das linhas para
Publicado em: 2007
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7. Remarks on gauge fixing and BRST quantization of noncommutative gauge theories
We consider the BRST gauge fixing procedure of the noncommutative Yang-Mills theory and of the gauged U(N) Proca model. An extended Seiberg-Witten map involving ghosts, antighosts and auxiliary fields for non-Abelian gauge theories is studied. We find that the extended map behaves differently for these models. For the Yang-Mills theory in the Lorentz gauge i
Brazilian Journal of Physics. Publicado em: 2005-09
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8. Fundamentos matematicos das teorias de calibre
The purpose of this dissertation is to revisit, from the point of view of some modern mathematical methods, the mathematical foundation of gauge theories. We study in detail the theories of fiber bundles and of conections on fiber bundles. We formulate the gauge theories in the language of principal fiber bundles, finding the Klein-Gordon equation and the Kl
Publicado em: 1992
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9. Stability and gap phenomena for Yang-Mills fields
It is shown that any weakly stable Yang-Mills field of type SU2 or SU3 on the four-sphere must be self-dual or anti-self-dual. Any Yang-Mills field on Sn, n ≥ 5, is unstable. Examples of stable fields on S4 and Sn/Γ for n ≥ 5 and Γ ≠ {e} are given. It is also shown that, for any Yang-Mills field R on S4, the pointwise condition ∥R-∥ 2 < 3 (or ∥
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10. Geometrical gauge theory of ghost and Goldstone fields and of ghost symmetries
We provide a geometrical identification of the ghost fields, essential to the renormalization procedure in the non-Abelian (Yang-Mills) case. These are some of the local components of a connection on a principal bundle. They multiply the differentials of coordinates spanning directions orthogonal to those of a given section, whereas the Yang-Mills potential
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11. Deformations of instantons
A study is made of the self-dual Yang-Mills fields in Euclidean 4-space. For SU(2) gauge theory it is rigorously shown that the solutions depend on 8k - 3 parameters, where k is the Pontrijagin index.
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12. Exterior gauging of an internal supersymmetry and SU(2/1) quantum asthenodynamics
A formally unitary Lagrangian model gauging an internal supersymmetry is proposed. The even subalgebra is gauged as a Yang-Mills theory, while the odd generators are gauged—according to Freedman's method—by skew tensor fields, equivalent dynamically to scalar Higgs fields. Chiral fermions are incorporated by following Townsend's construction and form irr