Search results for " Classical"
showing 10 items of 301 documents
L'azione del gruppo simplettico associata ad un'estensione quadratica di campi
2000
Given a quadratic extension L/K of fields and a regular alternating space (V; f) of finite dimension over L, we classify K-subspaces of V which do not split into the orthogonal sum of two proper K-subspaces. This allows one to determine the orbits of the group Sp_L(V; f) in the set of K-subspaces of V.
Unitary groups acting on hyperbolic substructures
2005
Given a quadratic extension L/K of fields and a regular l-Hermitian space (V,h) of finite dimension over L, we study the orbits of the group of isometries of (V,h) in the set of hyperbolic K-substructures of V.
A PHENOMENOLOGICAL OPERATOR DESCRIPTION OF INTERACTIONS BETWEEN POPULATIONS WITH APPLICATIONS TO MIGRATION
2013
We adopt an operatorial method based on the so-called creation, annihilation and number operators in the description of different systems in which two populations interact and move in a two-dimensional region. In particular, we discuss diffusion processes modeled by a quadratic hamiltonian. This general procedure will be adopted, in particular, in the description of migration phenomena. With respect to our previous analogous results, we use here fermionic operators since they automatically implement an upper bound for the population densities.
General invertible transformation and physical degrees of freedom
2017
An invertible field transformation is such that the old field variables correspond one-to-one to the new variables. As such, one may think that two systems that are related by an invertible transformation are physically equivalent. However, if the transformation depends on field derivatives, the equivalence between the two systems is nontrivial due to the appearance of higher derivative terms in the equations of motion. To address this problem, we prove the following theorem on the relation between an invertible transformation and Euler-Lagrange equations: If the field transformation is invertible, then any solution of the original set of Euler-Lagrange equations is mapped to a solution of …
El auto sacramental y la alegorización de la historia: "El socorro de Cádiz" de Juan Pérez de Montalbán
2012
Este trabajo estudia la relación excepcional entre acontecimientos históricos y género sacramental, a partir de un auto que se dio por perdido durante bastantes años. Se trata de El socorro de Cádiz de Juan Pérez de Montalbán en el que se alegoriza la defensa de Cádiz contra los ingleses en 1625. This paper analyzes the exceptional relationship between historical events and the sacramental genre, based on an «auto» that was considered lost during many years. This «auto» is El socorro de Cádiz by Juan Pérez de Montalbán, in which the playwright allegorizes the defense of Cádiz against the English in 1625.
La esclava del cielo, Santa Engracia, una comedia olvidada de Andrés de Claramonte
2009
La esclava del cielo, Santa Engracia, a forgotten play by Andrés de Claramonte Two are the objectives of this paper: in the first place, to elucidate the relationship that exists between the manuscript copy that has been preserved of a play entitled La esclava del cielo, Santa Engracia and the play of the same title that is mentioned in several documents of the 17th Century related to the professional companies of the autores Cristóbal Ortiz, Juan Bautista Valenciano and Juan Jerónimo Valenciano. In the second place, to critically analyze the attribution of La esclava del cielo, Santa Engracia to the playwright Andrés de Claramonte that appears in several of these documents, both by assessi…
Las pullas de Isabel(a) entre Lope y Góngora : modelos, versos y paratextos de 'Virtud, pobreza y mujer'
2021
Este artículo se ha beneficiado de mi participación en los proyectos de investigación PGC2018-094395-BI00, financiado por el Ministerio de Ciencia, Innovación y Universidades, PID2019-104045GB-C54 y PID2019-104045GB-C51, financiados por el Ministerio de Ciencia e Innovación y por fondos FEDER. El presente artículo aborda la relación entre dos comedias: Las firmezas de Isabela, de Luis de Góngora, y Virtud, pobreza y mujer, de Lope de Vega. Tras fijar la fecha de escritura de la segunda, se estipula que fue Lope quien pudo inspirarse en Góngora y no al revés (cuestión discutida), y se aclaran, amplían, matizan o desmienten las huellas de la comedia gongorina atisbadas hasta ahora por la crít…
Quasi-Lie Brackets and the Breaking of Time-Translation Symmetry for Quantum Systems Embedded in Classical Baths
2018
Many open quantum systems encountered in both natural and synthetic situations are embedded in classical-like baths. Often, the bath degrees of freedom may be represented in terms of canonically conjugate coordinates, but in some cases they may require a non-canonical or non-Hamiltonian representation. Herein, we review an approach to the dynamics and statistical mechanics of quantum subsystems embedded in either non-canonical or non-Hamiltonian classical-like baths which is based on operator-valued quasi-probability functions. These functions typically evolve through the action of quasi-Lie brackets and their associated Quantum-Classical Liouville Equations, or through quasi-Lie brackets a…
On some inequalities for the identric, logarithmic and related means
2015
We offer new proofs, refinements as well as new results related to classical means of two variables, including the identric and logarithmic means.
Toward a formalization of a two traders market with information exchange
2014
This paper shows that Hamiltonians and operators can also be put to good use even in contexts which are not purely physics based. Consider the world of finance. The work presented here {models a two traders system with information exchange with the help of four fundamental operators: cash and share operators; a portfolio operator and an operator reflecting the loss of information. An information Hamiltonian is considered and an additional Hamiltonian is presented which reflects the dynamics of selling/buying shares between traders. An important result of the paper is that when the information Hamiltonian is zero, portfolio operators commute with the Hamiltonian and this suggests that the dy…