Listar Ciencias Exactas y Naturales por autor "Girotti, Horacio Oscar"
Mostrando ítems 21-39 de 39
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Uma nova proposta para o curso de mestrado em física da UFRGS
(1991) [Artículo de periódico]A perda de apelo da pós-graduação em física a nível nacional e internacional, a existência de uma revolução tecnológica baseada essencialmente na Mecânica Quântica Não Relativística e que, portanto, não utiliza em seu ... -
On the consistency of the three-dimensional noncommutative supersymmetric Yang-Mlls theory
(2004) [Artículo de periódico]We study the one-loop quantum corrections to the U(N) noncommutative supersymmetric Yang–Mills theory in three spacetime dimensions (NCSYM3). We show that the cancellation of the dangerous UV/IR infrared divergences only ... -
On the finiteness of noncommutative supersymmetric QED/sub 3/ in the covariant superfield formulation
(2003) [Artículo de periódico]The three-dimensional noncommutative supersymmetric QED is investigated within the superfield approach. We prove the absence of UV/IR mixing in the theory at any loop order and demonstrate its one-loop finiteness. -
On the quantum dynamics of non-commutative systems
(2008) [Artículo de periódico]This is a review paper concerned with the global consistency of the quantum dynamics of non-commutative systems. Our point of departure is the theory of constrained systems, since it provides a unified description of the ... -
Poincaré invariance of a quantized duality symmetric theory
(1997) [Artículo de periódico]The noncovariant duality symmetric action put forward by Schwarz and Sen is quantized by means of the Dirac brackets quantization procedure. The resulting quantum theory is shown to be, nevertheless, relativistically ... -
Quantization of gauge-invariant theories through the dirac-bracket formalism
(1981) [Artículo de periódico]A physical system possessing first-class constraints is quantized by using the Dirac-bracket formalism. The main features of this quantization procedure are analyzed. The model enables us to present a situation where ... -
Quantum dynamics of chiral fermions in a model with anomalous breaking of gauge invariance
(1986) [Artículo de periódico]We study the quantum dynamics of chiral fermion fields minimally coupled to a gauge field. The model, originally proposed by Jackiw and Rajaraman, is known to exhibit the anomalous breaking of gauge invariance, which leads ... -
Reply to comment on "attractive forces bertween electrons in (2+1) - dimensional-qed"
(1993) [Artículo de periódico] -
Saturating field configurations for the massless thirring-wess model
(1979) [Artículo de periódico]The saturation of the massless Thirring-Wess model by induced field configurations is presented. The limiting procedure connecting the massless Thirring-Wess model arith the Schwinger model is reexamined. Special emphasis ... -
Saturation of the massive Schwinger model
(1980) [Artículo de periódico]We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ... -
Self-dual fields and causality
(1989) [Artículo de periódico]Causality aspects of two-dimensional self-dual fields are considered. We prove that there is no causal propagation for dimensionless self-dual fields whose Lagrangian does not contain dimensional parameters. It is shown ... -
Some comments about a static-localized solution for the massive thirring model
(1977) [Artículo de periódico]We derive the stability equation for a static-localized solution of the two-dimensional massive Thirring model. The corresponding eigenvalue spectrum is determined and compared with the eigenvalue spectrum of the stability ... -
Spontaneous symmetry breaking in noncommutative field theories
(2003) [Artículo de periódico]The spontaneous symmetry breaking of rotational O(N) symmetry in noncommutative field theory is investigated in a 2+1 dimensional model of scalar fields coupled through a combination of quartic and sextuple self-interactions. ... -
Superfield covariant analysis of the divergence structure of noncommutative supersymmetric QED/sub 4/
(2004) [Artículo de periódico]Commutative supersymmetric Yang-Mills is known to be renormalizable for N51,2, while finite for N 54. However, in the noncommutative version of the model (NCSQED4) the UV-IR mechanism gives rise to infrared divergences ... -
The fermion-fermion effective potential in the maxwell-chern-simons theory
(1992) [Artículo de periódico]The effective nonrelativistic potential VT describing the fermion-fermion interaction in the Maxwell-Chern-Simons theory is derived to the lowest order in perturbation theory. As expected, VT is not invariant under parity ... -
The low energy limit of the non-commutative Wess-Zumino model
(2002) [Artículo de periódico]The non-commutative Wess-Zumino model is used as a prototype for studying the low energy behavior of a renormalizable non-commutative field theory. We start by deriving the potentials mediating the fermion-fermion and ... -
The three-dimensional noncommutative nonlinear sigma model in superspace
(2001) [Artículo de periódico]We study the superspace formulation of the noncommutative nonlinear supersymmetric O(N) invariant sigma-model in 2+1 dimensions.We prove that the model is renormalizable to all orders of 1/N and explicitly verify that the ... -
Towards a consistent noncommutative supersymmetric Yang-Mills theory : superfield covariant analysis
(2004) [Artículo de periódico]Commutative four dimensional supersymmetric Yang-Mills (SYM) theory is known to be renormalizable for N=1,2, and finite for N=4. However, in the noncommutative version of the model the UV/IR mechanism gives rise to infrared ... -
Uniqueness of the functional approach
(1980) [Artículo de periódico]It is shown that the phase-space Schwinger equations can only be appropriately formulated in terms of a specific discrete procedure. Nevertheless, the solutions to Schwinger equations turn out to be independent of the ...
