Field theory approach to one-dimensional electronic systems

In this talk I describe a recently introduced field-theoretical approach that can be used as an alternative framework to study one-dimensional systems of highly correlated particles.Comment: 25 pages, latex, no figures. Talk delivered at Trends in Theoretical Physics - CERN - Santiago de Compostela - La Plata Meeting, La Plata, April-May 1997, to be published. Abstract modifie

Factored coset approach to bosonization in the context of topological backgrounds and massive fermions

We consider a recently proposed approach to bosonization in which the original fermionic partition function is expressed as a product of a $G/G$-coset model and a bosonic piece that contains the dynamics. In particular we show how the method works when topological backgrounds are taken into account. We also discuss the application of this technique to the case of massive fermions.Comment: 10 pages, latex, no figures, To appear in Mod.Phys.Lett.

Two-Dimensional Bosonization from Variable Shifts in the Path Integral

A method to perform bosonization of a fermionic theory in (1+1) dimensions in a path integral framework is developed. The method relies exclusively on the path integral property of allowing variable shifts, and does not depend on the explicit form of Greens functions. Two examples, the Schwinger model and the massless Thirring model, are worked out.Comment: 4 page

Restrictions over two-dimensional gauge models with Thirring-like interaction

Some years ago, it was shown how fermion self-interacting terms of the Thirring-type impact the usual structure of massless two-dimensional gauge theories [1]. In that work only the cases of pure vector and pure chiral gauge couplings have been considered and the corresponding Thirring term was also pure vector and pure chiral respectively, such that the vector (or chiral) Schwinger model should not lose its chirality structure due to the addition of the quartic interaction term. Here we extend this analysis to a generalized vector and axial coupling both for the gauge interaction and the quartic fermionic interactions. The idea is to perform quantization without losing the original structure of the gauge coupling. In order to do that we make use of an arbitrariness in the definition of the Thirring-like interaction.Comment: 9 pages, no figure

A COMPARATIVE APPROACH ON THE MOTIVATIONAL DOMINANTS AND PROFESSIONAL PERFORMANCE OF THE EMPLOYEES BELONGING TO PUBLIC AND PRIVATE ORGANIZATIONS

The approach on the professional performance of the employees must be dealt with from the perspective of the process of motivation and job satisfaction rising. Therefore, the knowledge and the analysis of the motivational dominants become increasingly important. The research lead to valid results if there is a clear separation between the public and the private organizations; where the way work is organized and the nature of the relationship among staff, influence the job satisfaction of the subjects, including their motivation. A comparative approach based on reliable methodological instruments is necessary, approach which could lead to obtaining reliable information and could offer an objective possibility of correlating indicators, enabling thus the knowledge of the motivation, attitudes, mentalities and professional goals of the interviewed subjects.motivation, motivational dominant, public organization, private organization, professional competence

Bosonization of Fermion Determinants

A four dimensional fermion determinant is presented as a path integral of the exponent of a local five dimensional action describing constrained bosonic system. The construction is carried out both in the continuum theory and in the lattice model.Comment: 9 pages, latex, no figure

Fermion Condensates of massless QED2QED_2 at Finite Density in non-trivial Topological Sectors

Vacuum expectation values of products of local bilinears $\bar\psi\psi$ are computed in massless $QED_2$ at finite density. It is shown that chiral condensates exhibit an oscillatory inhomogeneous behaviour depending on the chemical potential. The use of a path-integral approach clarifies the connection of this phenomenon with the topological structure of the theory.Comment: 16 pages, no figures, To be published in Phys.Rev.

Fermi-Bose duality via extra dimension

Representation of a $D$-dimensional fermion determinant as a path integral of exponent of a $(D+1)$-dimensional Hermitean bosonic action is constructed.Comment: 7 pages, LATE

Smooth Bosonization II: The Massive Case

The (1+1)-dimensional bosonization relations for fermionic mass terms are derived by choosing a specific gauge in an enlarged gauge-invariant theory containing both fermionic and bosonic fields. The fermionic part of the generating functional subject to the gauge constraint can be cast into the form of a strongly coupled Schwinger model, which can be solved exactly. The resulting bosonic theory coupled to the scalar sources then exhibits directly the bosonic counterparts of the fermionic scalar and pseudoscalar mass densities.Comment: 8 pages, Latex, CERN-TH-6563/9

A gauge invariant and string independent fermion correlator in the Schwinger model

We introduce a gauge invariant and string independent two-point fermion correlator which is analyzed in the context of the Schwinger model (QED_2). We also derive an effective infrared worldline action for this correlator, thus enabling the computation of its infrared behavior. Finally, we briefly discuss possible perspectives for the string independent correlator in the QED_3 effective models for the normal state of HTc superconductors.Comment: 14 pages, LaTe