Leptogenesis with exclusively low-energy CP Violation in the Context of Minimal Lepton Flavour Violation

We analyze lepton flavour violation (LFV) and the generation of the observed baryon-antibaryon asymmetry of the Universe (BAU) within a generalized minimal lepton flavour violation framework with three quasi-degenerate heavy Majorana neutrinos. The BAU which is obtained through radiative resonant leptogenesis can successfully be generated widely independent of the Majorana scale in this scenario and flavour effects are found to be relevant. Then we discuss the specific case in which CP violation is exclusively present at low-energies (a real R matrix) in the flavour sensitive temperature regime. Successful leptogenesis in this case leads to strong constraints on low-energy neutrino parameters.Comment: Contrubution to the proceedings of the EPS HEP 2007 conference, Manchester (UK). 3 pages, 3 figure

Evolution of Directed Triangle Motifs in the Google+ OSN

Motifs are a fundamental building block and distinguishing feature of networks. While characteristic motif distribution have been found in many networks, very little is known today about the evolution of network motifs. This paper studies the most important motifs in social networks, triangles, and how directed triangle motifs change over time. Our chosen subject is one of the largest Online Social Networks, Google+. Google+ has two distinguishing features that make it particularly interesting: (1) it is a directed network, which yields a rich set of triangle motifs, and (2) it is a young and fast evolving network, whose role in the OSN space is still not fully understood. For the purpose of this study, we crawled the network over a time period of six weeks, collecting several snapshots. We find that some triangle types display significant dynamics, e.g., for some specific initial types, up to 20% of the instances evolve to other types. Due to the fast growth of the OSN in the observed time period, many new triangles emerge. We also observe that many triangles evolve into less-connected motifs (with less edges), suggesting that growth also comes with pruning. We complement the topological study by also considering publicly available user profile data (mostly geographic locations). The corresponding results shed some light on the semantics of the triangle motifs. Indeed, we find that users in more symmetric triangle motifs live closer together, indicating more personal relationships. In contrast, asymmetric links in motifs often point to faraway users with a high in-degree (celebrities)

Tin and tungsten deposits: their relations to plate tectonics

[Resumen] En lo que sigue se va a hablar de los yacimientos de Sn y de W y de su relacion con los procesos de la tectónica d e placas como también de la situación actual de reservas en el mercado internacional. Conocimientos genéticos y modelos metalogenéticos son importantes para poder entender la formación y distribución de minerales. Eso puede servir para preparar los primeros pasos en la prospección como en la exploración minera de un yacimiento en explotación. Pero siempre habrá que tener en la mente que todos los conocimientos y modelos genéticos (teóricos) sólo son un esqueleto muerto, si no le dan vida las observaciones detalladas de campo.[Abstract] This paper gives an overview of tin and tungsten deposits and discusses their relation to modern plate tectonics. Furthermore, an introduction of economic aspects (reserves, production and actual situation on the world market) of the metals Sn and W is given

The Continental Deep Drilling Program (KTB) in the Federal Republic of Germany: drill hole KTB-Oberpfalz VE

[Resumen] En este trabajo se presenta el Programa del Sondeo Profundo Continental (KTB) en la República Federal de Alemania, sus objectivos y sus primeros pasos hasta la realizaci6n del sondeo previo KTB-Oberpfalz VB (NE de Baviera). Este sondeo corta rocas metamórficas del' basamento cristalino en el noroeste del Macizo Varíscico de Bohemia. En el perfil de los primeros 1.000 metros predominan paragneises y anfibolitas con notables mineralizaciones de sulfuros.[Abstract] An introduction is given into the Continental Deep Drilling Program (KTB) of the Federal Republic of Germany, the purpose of the KTB, and the first steps to the realization of the pre-drilling KTB-Oberpfalz VB (NE Bavaria). This borehole is situated in the metamorfic basement of the northwestern part of the Variscan Bohemian Massif. Within the first 1.000 meters paragneisses and anfibolites predominate and stockwork-like sulfide mineralizations are frequent

Informe previo de los estudios geoquímicos y mineralógicos del yacimiento estratiforme de W de Mina Susana (Santa Comba, NO de España) con una contribución a la prospección química

[Resumen] La mineralización estratiforme de scheelita está ligada a una serie de metasedimentitas ricas en anfiboles que se encuentra como "100.tejón" en un granito estéril de dos micas. Para la prospección geoquímica de otros "lentejones", Cr, Co, Ni, Cu y Zn, que están relacionados con los sulfuros y las concentraciones lenticulares de anfiboles en las metasedimentitas, pueden servir como elementos precursores.[Resumen] La mineralización estratiforme de scheelita está ligada a una serie de metasedimentitas ricas en anfiboles que se encuentra como "100.tejón" en un granito estéril de dos micas. Para la prospección geoquímica de otros "lentejones", Cr, Co, Ni, Cu y Zn, que están relacionados con los sulfuros y las concentraciones lenticulares de anfiboles en las metasedimentitas, pueden servir como elementos precursores.[Abstract] The stratiform scheelite mineralization is bounded to a suite of amphibole-rich metasediments lying lenticularly in a two-mica granite. Cr, Co, Ni, Cu and Zn are concentrated in sulfides and amphiboles of the metasediments and can be used as indicator elements in geochemical exploration for other lentils of metasediments[Zusammenfassung] Die stratiforme Scheelit-Vererzung ist aneine Serie amphibolreicher Metasedimentitegebunden, die als Linse in einem tauben Zweiglimmergrani t ansteht. Bei der geochemischen Prospektion weiterer Linsen lassen sich Cr, Co, Ni, Cu und Zn, die in den Sulfiden und Amphibolen der Metasedimentite konzentriert sind, als Pfadfinderelemente verwende