Navegação Ciências Exatas e da Terra por Autor "Gomes, Marcelo"
Resultados 1-18 de 18
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Attractive forces between electrons in (2+1) - dimensional QED
(1992) [Artigo de periódico]Vacuum polarization effects are nonperturbatively incorporated into the photon propagator to eliminate the severe infrared problems characteristic of (2+1)-dimensional QED (QED₃). The theory is thus rephrased in terms of ... -
Chiral bosonization
(1988) [Artigo de periódico]We show that the Dirac-bracket quantization of a single self-dual field leads naturally to the bosonization formulas. We find a numerical parameter describing the soliton charge and unveiling hidden soliton sectors. -
Chiral bosons through linear constraints
(1992) [Artigo de periódico]We study in detail the quantization of a model which apparently describes chiral bosons. The model is based on the idea that the chiral condition could be implemented through a linear constraint. We show that the space of ... -
A consistent noncommutative field theory : the Wess-Zumino model
(2000) [Artigo de periódico]We show that the noncommutative Wess–Zumino model is renormalizable to all orders of perturbation theory. The noncommutative scalar potential by itself is non-renormalizable but the Yukawa terms demanded by supersymmetry ... -
Coupling of fermions to the three-dimensional noncommutative CP/sup N-1/ model : minimal and supersymmetric extensions
(2004) [Artigo de periódico]We consider the coupling of fermions to the three-dimensional noncommutative CPN21 model. In the case of minimal coupling, although the infrared behavior of the gauge sector is improved, there are dangerous ~quadratic! ... -
Duality symmetry in the schwarz-sen model
(1997) [Artigo de periódico]The continuous extension of the discrete duality symmetry of the Schwarz-Sen model is studied. The corresponding infinitesimal generator Q turns out to be local, gauge invariant, and metric independent. Furthermore, Q ... -
Lorentz symmetry breaking in the noncommutative Wess-Zumino model : one loop corrections
(2006) [Artigo de periódico]In this paper we deal with the issue of Lorentz symmetry breaking in quantum field theories formulated in a noncommutative space-time. We show that, unlike in some recent analysis of quantum gravity effects, supersymmetry ... -
Low energy limit of the chern-simons theory coupled to fermions
(1997) [Artigo de periódico]We study the nonrelativistic limit of the theory of a quantum Chern-Simons field minimally coupled to Dirac fermions. To get the nonrelativistic effective Lagrangian one has to incorporate vacuum polarization and anomalous ... -
On the consistency of the three-dimensional noncommutative supersymmetric Yang-Mlls theory
(2004) [Artigo 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) [Artigo 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. -
Reply to comment on "attractive forces bertween electrons in (2+1) - dimensional-qed"
(1993) [Artigo de periódico] -
Self-dual fields and causality
(1989) [Artigo 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 ... -
Spontaneous symmetry breaking in noncommutative field theories
(2003) [Artigo 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) [Artigo 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) [Artigo 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) [Artigo 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) [Artigo 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) [Artigo 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 ...
