3,169 research outputs found

    Anomalous Transport in Holographic Chiral Superfluids via Kubo Formulae

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    We study anomalous conductivities in Chiral Superfluids in the framework of two different holographic models, by means of Kubo formulae. In addition, we point out the existence of an anomalous transport phenomenon that consists in the presence of a charge density when the superfluid velocity is aligned with a magnetic field. It has been pointed out recently that certain chiral conductivities in holographic superfluids exhibit universal behavior at zero temperature. We show that anomalous conductivities always stabilize at low temperatures in our setup. Even though the particular value they acquire is model-dependent, it seems to be robust and determined solely by the interplay between the broken symmetries and the anomalies.Comment: 23 pages, 22 figures. v2: references added, minor typos corrected. v3: footnotes added; published versio

    Inspección y análisis científico de las torres atalaya que defendieron el último reino islámico de la Península Ibérica

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    The Islamic Nasrid kingdom of Granada occupied the mountainous areas of the south-eastern area of the Iberian Peninsula. The Baetic mountain range worked as a natural frontier between the Nasrid kingdom and the Christian kingdom of Castile from 1232 to 1492. An extensive network of watchtowers was built by Nasrid to control this frontier stablishing visual communication between them and the Nasrid centre at the Alhambra citadel. Many of them are still standing, disperse through the provinces of Granada, Malaga, Almeria and the eastern parts of Jaen, Cordoba and Cadiz. Even being this military architecture protected by Spanish Heritage law, many of these medieval towers and their cultural landscapes are in severe risk. There are studies of individual towers, but any global comparative study has been developed. For this reason, within the framework of the R&D project called ‘Las atalayas que defendieron el reino nazarí de Granada. Análisis y documentación científica (Nazalaya)” (HAR2016-79689-P) financed by the Ministry of Economy, Industry and Competitiveness of Spain, the towers are being studied as individual exemplars as well as components of the same typological group. This generates a complete documentation constituted by a homogenous and exhaustively planimetry which supplements the existing information and enabling comparative analysis. Furthermore complete architectural surveys are being carried out using techniques as photogrammetry. In addition to the analysis of construction systems, the structural safety of these towers is evaluated formulating guidelines for its restoration.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Proyecto del Plan Nacional I+D+i (Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia) entitled ‘Las atalayas que defendieron el reino nazarí de Granada. Análisis y documentación científica (Nazalaya)’ (HAR2016-79689-P) Proyecto de Investigación Precompetitivo (mod. A) del Plan Propio de la Universidad de Málaga ‘La construcción de un paisaje: arquitectura de tapial en la Alta Andalucía en el siglo XIII. Estudio y análisis del sistema de torres andalusíes en el valle de Segura de la Sierra’ X Convocatoria de Proyectos de Investigación de la Fundación Pública Andaluza Centro de Estudios Andaluces en la modalidad de proyectos individuales, PRY/259/17 ‘Torres medievales y modernas conservadas en Andalucía. Documentación gráfica, análisis científico e interrelaciones

    From Physical Analogy to Digital Codification. Digital Turns, Complexity and Disruption

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    Drawing has been the most effective way to address architectural representation for centuries. This has allowed for the translation of these plans into built architecture. Based on projections, drawings define a one to one relation between the points of architecture and those cast onto the projection plane. That is to say: an analogy between the three-dimensional object –be it virtual, as in a project, or real, as in the case of the survey– and the drawing that anticipates or represents it, respectively, on the paper. The advent of the so-called digital turns has revolutionized architectural representation in various ways. Firstly, with the creation of the virtual space –a three-dimensional realm– designs came to be modelled instead of drawn. The relation of these models and the actual buildings remained analogical and the point to point correspondence persisted even if, instead of being limited to a bidimensional dominion, the prefiguring representation became three-dimensional too: a virtual model. Being this a substantial change as it may be, the real disruption introduced by computational design has to do with the substitution of analogy through coding. Parametric and algorithmic designs have replaced drawings or models by codes, breaking the visual relation between the designer and the object of his design. This should be credited as the most dramatic change introduced in architectural representation ever.Partially funded by the University of Alicante, Conselleria de Educación, Cultura y Deporte, Generalitat Valenciana
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