1. 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

2. Estudo do espectro das massas de blingagem de cor em QDC na rede a temperatura finita. / Study of the spectrum of color screening masses in lattice QCD to finite temperature.

In this work we study the spectrum of the lowest screening masses for Yang-Mills theories on the lattice. We used the gauge groups SU(2) and SU(3) in 2 + 1 and 3 + 1 dimensions. Calculations were done near the critical temperature of the confinement-desconfinement phase transition. We obtained values for the ratios of the screening masses consistent with pre

Publicado em: 2008

3. Comparison among HB-inspired algorithms for continuous-spin systems and gauge fields

We propose a new local algorithm for the thermalization of n-vector spin models, which can also be used in the numerical simulation of SU(N) lattice gauge theories. The algorithm combines heat-bath (HB) and micro-canonical updates in a single step - as opposed to the hybrid overrelaxation method, which alternates between the two kinds of update steps - while

Brazilian Journal of Physics. Publicado em: 2006-09

4. Gauge theories on the light-front

The light-front quantization of gauge theories in light-cone gauge provides a frame-independent wavefunction representation of relativistic bound states, simple forms for current matrix elements, explicit unitary, and a trivial vacuum. The light-front Hamiltonian form of QCD provides an alternative to lattice gauge theory for the computation of nonperturbati

Brazilian Journal of Physics. Publicado em: 2004-03

5. Spin systems in two dimensions and Gauge theories in four dimensions with Z(N) symmetry / Estudo de sistemas de spins a duas dimensões e de calibre a quatro dimensões com simetria Z(N)

Usando uma transformação de dualidade generalizada, considerações de simetria e supondo que as superfície críticas sejam contínuas, obtivemos o dia grama de fase para sistemas de spins Z (N) bidimensionais e sistemas com invariança de calibre Z (N) a quatro dimensões. Caracterizamos as diversas fases dos sistemas de spins pelo valor esperado das pot

Publicado em: 1980