Close to the edge: hierarchy in a double braneworld

We show that the hierarchy between the Planck and the weak scales can follow from the tendency of gravitons and fermions to localize at different edges of a thick double wall embedded in an $AdS_5$ spacetime without reflection symmetry. This double wall is a stable BPS thick-wall solution with two sub-walls located at its edges; fermions are coupled to the scalar field through Yukawa interactions, but the the lack of reflection symmetry forces them to be localized in one of the sub-walls. We show that the graviton zero-mode wavefunction is suppressed in the fermion edge by an exponential function of the distance between the sub-walls, and that the massive modes decouple so that Newtonian gravity is recuperated.Comment: Some typos corrected, references adde

Gauge field localization on brane worlds

We consider the effects of spacetime curvature and brane thickness on the localization of gauge fields on a brane via kinetic terms induced by localized fermions. We find that in a warped geometry with and infinitely thin brane, both the infrared and the ultraviolet behavior of the electromagnetic propagator are affected, providing a more stringent bound on the brane's tension than that coming from the requirement of four-dimensional gravity on the brane. On the other hand, for a thick wall in a flat spacetime, where the fermions are localized by means of a Yukawa coupling, we find that 4-dimensional electromagnetism is recovered in a region bounded from above by the same critical distance appearing in the thin case, but also from below by a new scale related to the brane's thickness and the electromagnetic couplings.Comment: 7 page

Fluid Membranes and 2d Quantum Gravity

We study the RG flow of two dimensional (fluid) membranes embedded in Euclidean D-dimensional space using functional RG methods based on the effective average action. By considering a truncation ansatz for the effective average action with both extrinsic and intrinsic curvature terms we derive a system of beta functions for the running surface tension, bending rigidity and Gaussian rigidity. We look for non-trivial fixed points but we find no evidence for a crumpling transition at $T\neq0$. Finally, we propose to identify the $D\rightarrow 0$ limit of the theory with two dimensional quantum gravity. In this limit we derive new beta functions for both cosmological and Newton's constants.Comment: 16 pages, 1 figur

Mathematical modeling and numerical simulation of a bioreactor landfill using Feel++

In this paper, we propose a mathematical model to describe the functioning of a bioreactor landfill, that is a waste management facility in which biodegradable waste is used to generate methane. The simulation of a bioreactor landfill is a very complex multiphysics problem in which bacteria catalyze a chemical reaction that starting from organic carbon leads to the production of methane, carbon dioxide and water. The resulting model features a heat equation coupled with a non-linear reaction equation describing the chemical phenomena under analysis and several advection and advection-diffusion equations modeling multiphase flows inside a porous environment representing the biodegradable waste. A framework for the approximation of the model is implemented using Feel++, a C++ open-source library to solve Partial Differential Equations. Some heuristic considerations on the quantitative values of the parameters in the model are discussed and preliminary numerical simulations are presented

Capacidades técnicas, legales y de gestión para equipos blue team y red team

Sin anexos.Con el presente informe técnico nos deja ver la metodología utilizada, las herramientas y los pasos que realizan los equipos Blue Team y Red Team para la atención ante un incidente de seguridad y los mecanismos de control implantados para su mitigación, como ayudan y refuerzan las medidas de seguridad de una organización con infraestructura TI, este informe se divide en varios pasos que son desde el análisis de la situación presentada, herramientas implementadas para el análisis e intrusión, la vulnerabilidad explotada, el desarrollo del ataque empleado por los ciberdelincuentes y las acciones correctivas ejecutadas para eliminar y remediar la vulnerabilidad presentada. También se verán las recomendaciones que los expertos consideran deben emplear en la organización, así como el resultado del análisis efectuado al incidente presentado en HackerHouse.This technical report allows us to see the methodology used, the tools and the steps carried out by the Blue Team and Red Team to respond to a security incident and the control mechanisms implemented for its mitigation, how they help and reinforce the measures. security of an organization with IT infrastructure, this report is divided into several steps that range from the analysis of the situation presented, tools implemented for analysis and intrusion, the exploited vulnerability, the development of the attack used by cybercriminals and the corrective actions executed to eliminate and remediate the vulnerability presented

El indicio penal no es un silogismo

Hoy, prácticamente todos los doctrinantes y la jurisprudencia (explícita o implícitamente), apelan a la categoría lógica del silogismo para definir el indicio penal. Creemos que se debe considerar la existencia de un modelo adicional de comprensión del indicio derivado de la teoría de la argumentación. Pugnan pues, en nuestra opinión, dos paradigmas por asumir la paternidad del indicio: el silogismo y la motivación. El modelo silogístico se basa en la estructura filosófica formalizada por Aristóteles para el conocimiento de la naturaleza principalmente, y por extensión y con menos fuerza, para la búsqueda de conclusiones probables

Editorial

Editoria

Migración hacia un modelo de persistencia orientada a objetos

El propósito de esta tesis es analizar el impacto generado al reemplazar el modelo de componentes EJB usado en la capa de persistencia por el modelo de desarrollo orientado a objetos. Para esto, se utilizará la arquitectura basada en componentes y los procesos de desarrollo empleados actualmente en la empresa de telecomunicaciones en donde desempeño mis actividades. Por último, se espera obtener distintas experiencias del proceso aplicado, que puedan ser usadas a la hora de migrar una plataforma de manejo de la persistencia basada en componentes a otra orientada a objetos, independientemente de la implementación asociada a esta última.Facultad de Informátic

Litter impacts on scenery and tourism on the Colombian north Caribbean coast

This paper provides the location, scenery and litter evaluation of 35 Colombian Caribbean beaches (9 remote, 9 village, 14 urban and 3 resort). Four litter grades were found. A: excellent (5); B: good (8); C: fair (19) and D: poor (3). A Decision Value parameter (D), for scenery gave: Class I - extremely attractive/natural, D > 0.85, 6 sites; Class II - attractive/natural sites, D = 0.85 -0.65, 2 sites; Class III - mainly natural sites, few outstanding features, D = 0.65-0.4, 1 site; Class IV - mainly unattractive sites, D = 0.4 to zero, 6 sites; Class V - very unattractive sites, D = <0, 20 sites. Litter amounts placed most beaches into a poor scenic category and many scenic beaches could jump a grade by means of clean-ups. A graphic methodology highlighted beaches with contradictory results for litter/scenic grades. Tourists abhor littered beaches and clean-ups would improve scenery scores