Confinement Of Quarks
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Lattice QCD: a nonperturbative study in the Feynman Gauge / QCD na rede: um estudo não-perturbativo no calibre de Feynman
The infrared behavior of gluon and ghost propagators is of fundamental importance for the understanding of the low-energy limit of quantum chromodynamics (QCD), especially with respect to the problem of the confinement of quarks and gluons. The goal of this thesis is to implement a new method to study the gluon propagator in the linear covariant gauge in lat
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/08/2011
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2. Oscilador de Dirac: ImplicaÃÃes da violaÃÃo da simetria de Lorentz e da massa dependente da posiÃÃo.
In this work we study the Dirac Oscillator (DO) in a threefold way. In the first way, we study DO with Lorentz symmetry violation. This violation is implemented through vectorial and an axial terms. We realize a non-relativistic limit and we obtain that the background vector field does not modify the energy spectrum. However, in the case of the background ax
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2008
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3. On the Faddeev-Popov operator eigenspectrum in topological background fields
During the last years significant progress has been made in the understanding of the confinement of quarks and gluons. However, this progress has been made in two directions, which are at first sight very different. On the one hand, topological configurations seem to play an important role in the formation of the static quark-anti-quark potential. On the oth
Brazilian Journal of Physics. Publicado em: 2007-07
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4. Connecting an effective model of confinement and chiral symmetry to lattice QCD
We construct an effective model for the chiral field and the Polyakov loop in which we can investigate the interplay between the approximate chiral symmetry restoration and the deconfinement of color in a thermal SU(3) gauge theory with three flavors of massive quarks. The phenomenological couplings between these two sectors can then be related to the recent
Brazilian Journal of Physics. Publicado em: 2007-03
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5. Confinement by design?
The configuration space of SU(N) gauge theory is restricted to orbits with vanishing Polyakov loops of non-trivial N-ality. A practical method of constraining to this orbit space C0 is found by implementing a certain axial-type gauge. It is shown that the representative of an orbit in C0 is unique in this gauge up to time independent Abelian gauge transforma
Brazilian Journal of Physics. Publicado em: 2007-03
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6. QCD Green functions and their application to hadron physics
In a functional approach to QCD the infrared behaviour of Landau gauge Green functions is investigated. It can be proven that the ghost Dyson-Schwinger equation implies the Gribov-Zwanziger horizon condition. Its relation to the Kugo-Ojima confinement scenario is elucidated. Positivity violation for gluons is demonstrated, and the analytic structure of the g
Brazilian Journal of Physics. Publicado em: 2007-03
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7. Correlation of the ghost and the quark in the lattice landau gauge QCD
Effects of the quark field on the ghost propagator of the lattice Landau gauge are investigated by using the unquenched SU(3) configurations produced by the MILC collaboration and compared with quenched gauge configurations of SU(2) first copy of the overrelaxation gauge fixing, the parallel tempering (PT) gauge fixing and quenched SU(3) 56(4) configurations
Brazilian Journal of Physics. Publicado em: 2007-03
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8. Estudo da espectroscopia de massas de mesons segundo um modelo de potencial inspirado em cromodinamica quantica
Since the discovery of QCD (Quantum Chromodynamics), there have been remarkable technical achievements in perturbative calculations applied to hadrons. However, it is difficult to use QCD directly to compute hadronic properties. In this context, phenomenological potential models have provided extremely satisfactory results on description of ordinary hadrons,
Publicado em: 2001
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9. O loop de Wilson em quarta ordem / The Wilson loop in the fourth order
o loop de Wilson se apresenta como uma variável muito apropriada para servir de base para uma teoria das forças nucleares. Esta afirmação é justificada se lembrarmos que a apresentação usual da cromodinâmica quântica perturbativa parte de variáveis coloridas, um fato altamente criticável, pois elas não representam qualquer variável física, enqu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/1984