Properties of rotating Einstein-Maxwell-Dilaton black holes in odd dimensions

We investigate rotating Einstein-Maxwell-Dilaton (EMd) black holes in odd dimensions. Focusing on black holes with equal-magnitude angular momenta, we determine the domain of existence of these black holes. Non-extremal black holes reside with the boundaries determined by the static and the extremal rotating black holes. The extremal EMd black holes show proportionality of their horizon area and their angular momenta. Thus the charge does not enter. We also address the Einstein-Maxwell case, where the extremal rotating black holes exhibit two branches. On the branch emerging from the Myers-Perry solutions their angular momenta are proportional to their horizon area, whereas on the branch emerging from the static solutions their angular momenta are proportional to their horizon angular momenta. Only subsets of the near-horizon solutions are realized globally. Investigating the physical properties of these EMd black holes, we note that one can learn much about the extremal rotating solutions from the much simpler static solutions. The angular momenta of the extremal black holes are proportional to the area of the static ones for the Kaluza-Klein value of the dilaton coupling constant, and remain analogous for other values. The same is found for the horizon angular velocities of the extremal black holes, which possess an analogous behavior to the surface gravity of the static black holes. The gyromagnetic ratio is rather well approximated by the `static' value, obtained perturbatively for small angular momenta.Comment: 40 pages, 10 figure

Angular momentum-area proportionality of extremal charged black holes in odd dimensions

Extremal rotating black holes in Einstein-Maxwell theory feature two branches. On the branch emerging from the Myers-Perry solutions their angular momentum is proportional to their horizon area, while on the branch emerging from the Tangherlini solutions their angular momentum is proportional to their horizon angular momentum. The transition between these branches occurs at a critical value of the charge, which depends on the value of the angular momentum. However, when a dilaton is included, the angular momentum is always proportional to the horizon area.Comment: 5 pages, 2 figure

Investigación en intervención en el patrimonio construido : entre las dificultades metodológicas y las diferencias ideológicas

Las comunicaciones presentadas sobre el tema del Patrimonio Construido de las I Jornadas de Investigación en Construcción, junto con la ponencia general y las conclusiones a las que se llego en el debate final, dibujan un panorama bastante representativo de la situación actual en España de este ámbito particular de la investigación relacionado con la intervención sobre edificios monumentales o no. (Véase la bibliografía). El objetivo de esta comunicación es continuar el proceso iniciado sobre la elaboración de criterios sobre cuál ha de ser el desarrollo del conjunto de investigaciones que tienen por objeto de estudio cualquiera de los muchos temas pendientes en la intervención en el patrimonio construido. Las grandes áreas en las que se pueden situar estas investigaciones son dos: 1) sobre los edificios u obras públicas antes de intervenir en ellos 2) sobre procedimientos y técnicas de intervención. El primer grupo tiene como objetivo: 1.1) incrementar el conocimiento y comprensión general de los materiales, elementos, subsistemas y sistemas históricos que configuran nuestros edificios y obras públicas existentes. 1.2) incrementar el conocimiento y comprensión particular de los materiales, elementos, subsistemas y sistemas históricos que configuran cada edificio concreto 1.3) desarrollar centros específicos de investigación técnicas eficientes de auscultación y modelización que permitan conocer mejor los edificios existentes especialmente en sus escalas de mayor dificultad, es decir, elemento, subsistema, sistema. Los del segundo grupo tienen como objetivo: 2.1) desarrollar en centros específicos experimentación sobre técnicas de intervención en los edificios que abarquen todas las escalas, material, elemento, subsistema, sistema. 2.2) desarrollar estudios sobre la aplicabilidad y durabilidad derivadas de la eficiencia o a corto y, especialmente, a largo plazo de las diversas técnicas de intervención en sus diversas escalas, material, elemento, subsistema y sistema, teniendo como laboratorios los mismos. Como ya se ha dicho antes, el objetivo de esta comunicación es continuar el proceso iniciado sobre la elaboración de criterios sobre cuál ha de ser el desarrollo del conjunto de investigaciones que tienen por objeto de estudio cualquiera de los muchos temas pendientes en la intervención en el patrimonio construido. Pero mi experiencia personal me lleva a constatar que los problemas básicos son demasiado importantes como para pensar que podemos llegar a tomar decisiones de una manera racional. Creo que la mejor contribución que puedo hacer a esta Jornadas es transcribir varias de las reflexiones sobre todo ello que he escrito en los dos o tres años anteriores y que, con toda probabilidad, ninguno de los presentes en ellas ha leído. También creo que este texto no leerá nadie. Creo que ya sería hora de revisar el mandato de publicar o morir

Proposal for spanish guidelines on application of the Building code to legally protected heritage buildings

Paper in: Report of the IRCC Workshop, Architectural Heritage and Performance-Based Building Codes: Approaches and Experiences. Inter-jurisdiction Regulatory Collaboration Committee (IRCC), Ministerio de la Vivienda. Madrid, Spain. 13 November 2008Preprin

Employment policies: A methodology approach to the identification of employment opportunities

Unemployment rate in Spain is twice the average unemployment rate in the European Union. The economic literature has identify two main features of spanish unemployment: it is very extremly high and it is persistent. The behaviour of regional unemployment rate presents even more critical situations. For example, Andalusia has an unemployment rate of more than 32%. In this context, the creation of employmnet in traditional economic sectors is not sufficient. New employment opportunities must be discovered and exploted. This paper presents a tentative approach to the identification of employment opportunities in social services with potential posibilities of employment. We present an approach to a macroscopic and strategic public policy. In our oppinion, this policy must follow this steps: 1) Study of the geographical situation of the public service necesities. 2) Identification of potential clients and demand. 3) Definition of social requested services. This macroscopic and strategic analysis constitutes the initial basis of a more deep study to detect employment opportunities in which tratitional markets studies, labour supply and demand, institutional and cultural features will be eessential. Key words: employment opportunities, employment policy, employment deposit

Radial excitations of non-static J=0J=0 black holes in Einstein-Maxwell-Chern-Simons gravity

We study the generalization of the Kerr-Newmann black hole in 5D Einstein-Maxwell-Chern-Simons theory with free Chern-Simons coupling parameter. These black holes possess equal magnitude angular momenta and an event horizon of spherical topology. We focus on the extremal case with zero temperature. We find that, when the Chern-Simons coupling is greater than two times the supergravity case, new branches of black holes are found which violate uniqueness. In particular, a sequence of these black holes are non-static radially excited solutions with vanishing angular momentum. They approach the Reissner-Nordstr\"om solution as the excitation level increases.Comment: 6 pages, 2 figure

New black holes in D=5D=5 minimal gauged supergravity: Deformed boundaries and frozen horizons

A new class of black hole solutions of the five dimensional minimal gauged supergravity is presented. They are characterized by the mass, the electric charge, two equal magnitude angular momenta and the magnitude of the magnetic potential at infinity. These black holes possess a horizon of spherical topology; however, both the horizon and the sphere at infinity can be arbitrarily squashed, with nonextremal solutions interpolating between black strings and black branes. A particular set of extremal configurations corresponds to a new one-parameter family of supersymmetric black holes. While their conserved charges are determined by the squashing of the sphere at infinity, these supersymmetric solutions possess the same horizon geometry.Comment: 5 pages, 4 figures; v3: typos corrected, refs added; matches published versio

Sequences of extremal radially excited rotating black holes

In Einstein-Maxwell-Chern-Simons theory the extremal Reissner-Nordstr\"om solution is no longer the single extremal solution with vanishing angular momentum, when the Chern-Simons coupling constant reaches a critical value. Instead a whole sequence of rotating extremal J=0 solutions arises, labeled by the node number of the magnetic U(1) potential. Associated with the same near horizon solution, the mass of these radially excited extremal solutions converges to the mass of the extremal Reissner-Nordstr\"om solution. On the other hand, not all near horizon solutions are also realized as global solutionsComment: 5 pages, 6 figure

Primary Sector Evolution: 1999-2009

nalysing the current situation of agriculture is very important because the economy in a lot of regions is based on this sector. For this reason, the present scenario in many regions mirrors that of agriculture. Farms and their structural evolution over the last decade allow us to see the effects of factors such as the economic crisis and the changes in Common Agrarian Policy (CAP) on this sector and the economies of some regions.In this sense, European countries compiled agrarian censuses in 2009 and 2010 to comply with the legal regulations established by the European Council in order to obtain a framework or directory of farms that could serve to carry out sampling designs for sectorial agricultural surveys. These censuses have been elaborated in Spain since 1982 and are the main source of primary sector information.Thus, in this paper we have used the agrarian census data from 2009 to analyse the current situation of farms. In addition, information from the 1999 agrarian census has been used to ascertain the main changes that have taken place in these farms during this decade. This analysis has made it possible to determine the main effects that the worldwide economic crisis has had on farm structure and, therefore, on the hard-hit agrarian economy