New look at the QCD ground state in a magnetic field

We explore chiral symmetry breaking in a magnetic field within a Nambu-Jona-Lasinio model of interacting massless quarks including tensor channels. We show that the new interaction channels open up via Fierz identities due to the explicit breaking of the rotational symmetry by the magnetic field. We demonstrate that the magnetic catalysis of chiral symmetry breaking leads to the generation of two independent condensates, the conventional chiral condensate and a spin-one condensate. While the chiral condensate generates a dynamical fermion mass, the new condensate gives rise to a dynamical anomalous magnetic moment for the fermions. As a consequence, the spectrum of the excitations in all Landau levels, except the lowest one, exhibits Zeeman splitting. Since the pair, formed by a quark and an antiquark with opposite spins, possesses a resultant magnetic moment, an external magnetic field can align it giving rise to a net magnetic moment for the ground state. This is the physical interpretation of the spin-one condensate. Our results show that the magnetically catalyzed ground state in QCD is actually richer than previously thought. The two condensates contribute to the effective mass of the LLL quasiparticles in such a way that the critical temperature for chiral symmetry restoration becomes enhanced.Comment: PRD version with updated Reference

Actualización de la plataforma de servicios de voz mediante el desarrollo de tecnología IP con implementación basada en metodología de proyectos

Estudio que surge de la necesidad de fortalecer la metodología de administración de proyectos empleada en una organización, sobre todo en proyectos que envuelven la infraestructura de TI. Los objetivos fueron migrar a un sistema de telecomunicaciones basado en Voz sobre IP para mejorar la disponibilidad del servicio de telefonía, aumentar la calidad en el servicio y aprovechar las nuevas aplicaciones y utilidades que brinda Voz sobre IP

Quantum social networks

We introduce a physical approach to social networks (SNs) in which each actor is characterized by a yes-no test on a physical system. This allows us to consider SNs beyond those originated by interactions based on pre-existing properties, as in a classical SN (CSN). As an example of SNs beyond CSNs, we introduce quantum SNs (QSNs) in which actor is characterized by a test of whether or not the system is in a quantum state. We show that QSNs outperform CSNs for a certain task and some graphs. We identify the simplest of these graphs and show that graphs in which QSNs outperform CSNs are increasingly frequent as the number of vertices increases. We also discuss more general SNs and identify the simplest graphs in which QSNs cannot be outperformed.Comment: REVTeX4, 6 pages, 3 figure

Basic exclusivity graphs in quantum correlations

A fundamental problem is to understand why quantum theory only violates some noncontextuality (NC) inequalities and identify the physical principles that prevent higher-than-quantum violations. We prove that quantum theory only violates those NC inequalities whose exclusivity graphs contain, as induced subgraphs, odd cycles of length five or more, and/or their complements. In addition, we show that odd cycles are the exclusivity graphs of a well-known family of NC inequalities and that there is also a family of NC inequalities whose exclusivity graphs are the complements of odd cycles. We characterize the maximum noncontextual and quantum values of these inequalities, and provide evidence supporting the conjecture that the maximum quantum violation of these inequalities is exactly singled out by the exclusivity principle.Comment: REVTeX4, 7 pages, 2 figure

Implantación de un Ambiente Virtual de Aprendizaje en la plataforma moodle con cuatro módulos de apoyo para los funcionarios del CTI dirección seccional Nariño-Putumayo.

Debido a que las instituciones gubernamentales tales como la Dirección Seccional Nariño-Putumayo del Cuerpo Técnico de Investigación quieren optimizar las competencias del talento humano de la entidad generando profesionalismo y aumentando la productividad de sus funcionarios, el proyecto que se describe a continuación busca el desarrollo, diseño e implementación de recursos digitales como apoyo al proceso de formación de peritos del CTI en las distintas áreas tales como Documentología, Automotores, Fotografía Forense y Video. La implantación de un ambiente virtual de aprendizaje en la plataforma Moodle con cuatro módulos de apoyo al proceso de formación, permite establecer estrategias de enseñanza y aprendizaje utilizando un recurso tecnológico acorde a la educación de dichos funcionarios