Extended D=3D=3 Bargmann supergravity from a Lie algebra expansion

In this paper we show how the method of Lie algebra expansions may be used to obtain, in a simple way, both the extended Bargmann Lie superalgebra and the Chern-Simons action associated to it in three dimensions, starting from $D=3$, $\mathcal{N}=2$ superPoincar\'e and its corresponding Chern-Simons supergravity.Comment: 17 page

Best approach regions for potential spaces

We characterize the approach regions so that the non-tangential maximal function is of weak-type on potential spaces, for which we use a simple argument involving Carleson measure estimates

Kerker Conditions Upon Lossless, Absorption, and Optical Gain Regimes

The directionality and polarization of light show peculiar properties when the scattering by a dielectric sphere can be described exclusively by electric and magnetic dipolar modes. Particularly, when these modes oscillate in-phase with equal amplitude, at the so-called first Kerker condition, the zero optical backscattering condition emerges for non-dissipating spheres. However, the role of absorption and optical gain in the first Kerker condition remains unexplored. In this work, we demonstrate that either absorption or optical gain precludes the first Kerker condition and, hence, the absence of backscattered radiation light, regardless of the size of the particle, incident wavelength, and incoming polarization. Finally, we derive the necessary prerequisites of the second Kerker condition of the zero forward light scattering, finding that optical gain is a compulsory requirement

Solvable Lie algebras are not that hypo

We study a type of left-invariant structure on Lie groups, or equivalently on Lie algebras. We introduce obstructions to the existence of a hypo structure, namely the 5-dimensional geometry of hypersurfaces in manifolds with holonomy SU(3). The choice of a splitting g^*=V_1 + V_2, and the vanishing of certain associated cohomology groups, determine a first obstruction. We also construct necessary conditions for the existence of a hypo structure with a fixed almost-contact form. For non-unimodular Lie algebras, we derive an obstruction to the existence of a hypo structure, with no choice involved. We apply these methods to classify solvable Lie algebras that admit a hypo structure.Comment: 21 pages; v2: presentation improved, typos corrected, notational conflicts eliminated. To appear in Transformation Group

Technological and infrastructure collaborative seismic research in Western Mexico

In February and March 2014, Spanish, Mexican and British scientists and technicians explored the western margin of Mexico, a region with a high occurrence of large earthquakes (> Mw = 7.5) and tsunami generation, on board the British Royal Research Ship James Cook. This successful joint cruise, named TSUJAL, was made possible thanks to a cooperative agreement between NERC and CSIC as part of the Ocean Facilities Exchange Group (OFEG), a major forum of European oceanographic institutions for the exchange of ship time, equipment and personnel. A dense geophysical data set was acquired using for the first time 6 km length seismic streamer facilities from Spain’s Consejo Superior de Investigaciones Cientificas (CSIC), usually operating in the Spanish RV Sarmiento de Gamboa, onboard the British RRS James Cook by solving all mechanical, electrical and electronic problems. The RRS James Cook in turn provides the seismic source and the acoustic, hullmounted echosounder operated by the British Natural Environment Research Council (NERC). Multiscale seismic and echosounder images unravel the subduction geometry, nature of the crust, and evidence faults and mass wasting processes. The data are crucial to estimating fault seismic parameters, and these parameters are critical to carrying out seismic hazard in Mexico, especially when considering largemagnitude earthquakes (Mw 8.0), and to constrain tsunami models.Peer Reviewe

Los estudios afroamericanos y africanos en América Latina: herencia, presencia y visiones del otro

Este libro se propone reflejar el estado de la cuestión acerca de la enseñanza y la investigación sobre África y su diáspora en América Latina. Producto de un encuentro convocado por el Programa Sur-Sur de CLACSO en Salvador de Bahía en el año 2006, donde académicos de muy diversas áreas y de diferentes países de América Latina debatieron sobre nuevos abordajes y líneas de investigación, y sobre la enseñanza y difusión de estas temáticas. Esta obra nos introduce desde una perspectiva pluralista y multifocal de la realidad en campos no tradicionales de la academia, identificando trayectorias, impulsos renovadores, influencias externas y paradigmas propios.Indice Prefacio Maria José Becerra y Diego Buffa Los estudios sobre África y Afroamérica en América Latina. El estado del arte. Gladis Lechini Parte I Estudios Afroamericanos O racismo brasileiro em questão: temas relevantes no debate recente Paula Cristina da Silva Barreto História e historiografia do trabalhador esclavizado no RS: 1819-2006 Mario Maestri A abolição do Comércio Atlãntico de Escravos e os Africanos Livres no Brasil. Ana Flavio Cicchelli Pires De la desaparición de los negros a la reaparición de los afrodescendientes:comprendiendo las políticas de las identidades negras, las clasificaciones raciales y de su estudio en Argentina. Alejandro Frigerio Estudios sobre esclavitud en Córdoba: análisis y perspectivas. Maria José Becerra La historiografía paraguaya y los afrodescendientes. Ignacio Telesca Las raíces del olvido. Un estado de la cuestión sobre el estudio de las poblaciones de origen africano en México. Salvador Vásquez Fernández El que no tiene de inga tiene de mandinga. Género, Etnicidad y Sexualidad en los Estudios Históricos-Antropológicos Afroperuanos. Fátima Valdivia del Río Música, artes performáticas y el campo de las relaciones raciales. Área de estudios de la presencia africana en América Latina. Luis Ferreira Makl Parte II. Estudios sobre África O Ensino e a Pesquisa sobre África no Brasil e a Lei 10.639 Luena Nascimento Nunes Pereira Os estudos africanos no Brasil Um estudo de caso: o CEAA José María Nunes Pereira La enseñanza de la historia de África en Cuba. Aproximación a sus presupuestos teóricos y metodológicos. M. Elena Álvarez Acosta Estudios africanos en Colombia desde Ciencias Políticas y Sociales. Maguemati Wabgou Pasado y presente en los estudios e investigaciones sobre África en Argentina. Diego Buffa Estudios sobre África desde Argentina. Los aportes de la Universidad de Buenos Aires y de la Universidad Nacional del Luján. Marisa Pineau La enseñanza y la investigación sobre África y Afroamérica de la Universidad Nacional de La Plata-Argentina. Marta Maffia Los estudios sobre el Norte de África en Brasil y Argentina: reflexiones en torno a un espacio residual. Juan José Vagni La perspectiva Iberoamericana Consideraciones sobre estudios afroamericanos y africanos en Iberoamérica. Luis Beltrá

Territorial plannnig in a river basin with high erosion level using multicriteria decision methods in cordoba province(argentine)

The erosion-sedimentation-flooding processes in large zones of Argentine are a critical problem that involve complex relationships with technological, economic, social and environmental cause-effect. The increasing of agricultural activities in new areas previously with forestry or pasture could produce irreversible environmental impacts. It is necessary to prepare a spatial plan taking into consideration, economic development, social cohesion, environmental quality and progressive desertification. Multicriteria decision models contribute to the elaboration of that plan and provide an inestimable aid to decision makers. The objective of this paper is to elaborate a multicriteria model applied to the La Colacha Basin (Cordoba-Argentine). La Colacha Basin has 416 km2, it is a representative basin of a dry-sub-humid area where agriculture practices are progressively increased. Ten alternatives have been evaluated combining: (a) Agro-forest-pastoral (ASP), Present use (ACT) e Intensive use (INT), (b) with or without Soil conservation (CS), y (c) with or without Hydrological arrangement of the basin (OH). There have been selected 13 criteria. Different Multi-criteria Decision Methods, both of traditional or developed by the authors, have been used