The Thirring interaction in the two-dimensional axial-current-pseudoscalar derivative coupling model

The authors reexamine the two-dimensional model of massive fermions interacting with a massless pseudoscalar field via axial-current-pseudoscalar derivative coupling. Performing a canonical field transformation on the Bose field algebra the model is mapped into the Thirring model with an additional vector-current-scalar-derivative interaction (Schroer-Thirring model). The complete bosonized version of the model is presented. The bosonized composite operators of the quantum Hamiltonian are obtained as the leading operators in the Wilson short distance expansion.Comment: 13 page

Structural aspects of the fermion-boson mapping in two-dimensional gauge and anomalous gauge theories with massive fermions

Using a synthesis of the functional integral and operator approaches we discuss the fermion-boson mapping and the role played by the Bose field algebra in the Hilbert space of two-dimensional gauge and anomalous gauge field theories with massive fermions. In the $QED_2$ with quartic self-interaction among massive fermions, the use of an auxiliary vector field introduces a redundant Bose field algebra that should not be considered as an element of the intrinsic algebraic structure defining the model. In the anomalous chiral $QED_2$ with massive fermions the effect of the chiral anomaly leads to the appearance in the mass operator of a spurious Bose field combination. This phase factor carries no fermion selection rule and the expected absence of $\theta$-vacuum in the anomalous model is displayed from the operator solution. Even in the anomalous model with massive Fermi fields, the introduction of the Wess-Zumino field replicates the theory, changing neither its algebraic content nor its physical content.Comment: 26 pages, Revte

Thermofield-Bosonization on Compact Space

We develop the construction of fermionic fields in terms of bosonic ones to describe free and interaction models in the circle, using thermofielddynamics. The description in the case of finite temperature is developed for both normal modes and zero modes. The treatment extends the thermofield-bosonization for periodic space

Decoupled path integral formulation of chiral QCD2_2 with aJR=2a_{JR}=2

We analyse the BRST constraints and corresponding Hilbert-space structure of chiral QCD$_2$ in the decoupled formulation for the case of the Jackiw-Rajaraman parameter $a=2$. We show that despite formal similarities this theory is not equivalent to QCD$_2$, and that its extension to U(N) does not lead to an infinite vacuum degeneracy.Comment: LaTeX, 22 page

Metodologie di indagine per la Carta archeologica e il Sistema Informativo Territoriale del Parco archeologico e paesaggistico di Agrigento.

Una indagine sistematica nell'area del Parco archeologico di Agrigento, sia all'interno delle mura dell'antica colonia greca di Akragas, sia nel suburbio. E' stata eseguita una prospezione archeologica intensiva e sistematica utilizzando metodologie GIS e GPS, e i dati sono stati inseriti in un SIT appositamente realizzato

Storiografia e architettura: il caso Gurlitt/Valguarnera

En 1916, Cornelius Gurlitt - historien allemand d’architecture qui a beaucoup contribué à la réévaluation de l’art baroque - travaillait à la seconde édition de son «Histoire du Baroque en Italie». L’equipe de recherche qu’il avait envoyé en Sicile, avait effectué un relevé complet de la villa Valguarnera à Bagheria, l’un des ensembles monumentaux parmi les plus importants de l’Italie méridionale. Mais cette seconde édition de son œuvre ne fut jamais publiée et ce précieux relevé semble avoir dispar