Generalized Pure Lovelock Gravity

We present a generalization of the n-dimensional (pure) Lovelock Gravity theory based on an enlarged Lorentz symmetry. In particular, we propose an alternative way to introduce a cosmological term. Interestingly, we show that the usual pure Lovelock gravity is recovered in a matter-free configuration. The five and six-dimensional cases are explicitly studied.Comment: v2, 16 pages, references and comments adde

Instituciones que ofrecen servicios de capacitación en la ciudad de Barranquilla : caracterización y análisis comparativo con el Centro de Educación Continuada, CEC, de la Universidad del Norte.

Tesis (Magíster en Administración de Empresas) -- Universidad del Norte. Programa de Maestría en Administración de Empresas, 2008.Conocer cuáles son las principales características, servicios y estrategias que implementan las Instituciones de Educación Superior que ofrecen servicios de capacitación en la ciudad de Barranquilla, competidores directos y sustitutos, comparativamente con las acciones que realiza el Centro de Educación Continuada, CEC de la Universidad del Norte es el objeto de este estudio. La metodología que se utilizó fue la cualitativa partiendo de una muestra seleccionada de Instituciones de Educación Superior, teniendo en cuenta los siguientes criterios: reconocimiento institucional, sede en Barranquilla y evidencia en la oferta de programas de capacitación, como lo son la Universidad de los Andes y la Universidad Javeriana. Así mismo se realizó un análisis descriptivo de las características relevantes de los competidores sustitutos: agremiaciones y asociaciones Cámara de Comercio de Barranquilla y Fenalco. Para realizar el análisis comparativo se seleccionaron las siguientes variables comunes: Portafolio de Servicios, Precios, Promoción, Servicios/valores agregados, infraestructura. Los resultados reafirman el posicionamiento del Centro de Educación Continuada, CEC de la Universidad del Norte, sus ventajas competitivas frente a sus competidores representadas en la amplitud y variedad de programas que integran su portafolio, operación logística y administrativa, equipo humano profesional con gran experiencia en la organización de eventos

Enlarged super-bms3\mathfrak{bms}_{3} algebra and its flat limit

In this paper we analyze the asymptotic symmetries of the three-dimensional Chern-Simons supergravity for a supersymmetric extension of the semi-simple enlargement of the Poincar\'e algebra, also known as AdS-Lorentz superalgebra, which is characterized by two fermionic generators. We propose a consistent set of asymptotic boundary conditions for the aforementioned supergravity theory, and we show that the corresponding charge algebra defines a supersymmetric extension of the semi-simple enlargement of the $\mathfrak{bms}_{3}$ algebra, with three independent central charges. This asymptotic symmetry algebra can alternatively be written as the direct sum of three copies of the Virasoro algebra, two of which are augmented by supersymmetry. Interestingly, we show that the flat limit of the obtained asymptotic algebra corresponds to a deformed super-$\mathfrak{bms}_{3}$ algebra, being the charge algebra of the minimal Maxwell supergravity theory in three dimensions.Comment: 17 page

Generalized Chern-Simons higher-spin gravity theories in three dimensions

The coupling of spin-3 gauge fields to three-dimensional Maxwell and $AdS$-Lorentz gravity theories is presented. After showing how the usual spin-3 extensions of the $AdS$ and the Poincar\'e algebras in three dimensions can be obtained as expansions of $\mathfrak{sl}\left( 3,\mathbb{R}\right)$ algebra, the procedure is generalized so as to define new higher-spin symmetries. Remarkably, the spin-3 extension of the Maxwell symmetry allows one to introduce a novel gravity model coupled to higher-spin topological matter with vanishing cosmological constant, which in turn corresponds to a flat limit of the $AdS$-Lorentz case. We extend our results to define two different families of higher-spin extensions of three-dimensional Einstein gravity.Comment: version 3, 28 pages, accepted version in Nuclear Physics

Seguro animal, ¿animal seguro?

Treball presentat a l'assignatura de Deontologia i Veterinària Legal (21223

Three-dimensional non-relativistic supergravity and torsion

In this paper we present a torsional non-relativistic Chern-Simons teleparallel (super)gravity theory in three spacetime dimensions. We start by developing the non-relativistic limit of the purely bosonic relativistic teleparallel Chern-Simons formulation of gravity. On-shell the latter yields a non-Riemannian setup with non-vanishing torsion, which, at non-relativistic level, translates into a non-vanishing spatial torsion sourced by the cosmological constant. Then we consider the three-dimensional relativistic $\mathcal{N}=2$ Chern-Simons supergravity theory and obtain its non-relativistic counterpart by exploiting a Lie algebra expansion method. The non-relativistic supergravity theory is characterized, on-shell, by a non-vanishing spatial super-torsion, again sourced by the cosmological constant.Comment: 23 page

Non-relativistic limit of the Mielke-Baekler gravity theory

In this paper, we present the most general non-relativistic Chern-Simons gravity model in three spacetime dimensions. We first study the non-relativistic limit of the Mielke-Baekler gravity through a contraction process. The resulting non-relativistic theory contains a source for the spatial component of the torsion and the curvature measured in terms of two parameters, denoted by $p$ and $q$. We then extend our results by defining a Newtonian version of the Mielke-Baekler gravity theory, based on a Newtonian like algebra which is obtained from the non-relativistic limit of an enhanced and enlarged relativistic algebra. Remarkably, in both cases, different known non-relativistic and Newtonian gravity theories can be derived by fixing the $\left(p,q\right)$ parameters. In particular, torsionless models are recovered for $q=0$.Comment: 20 page