Application of initial data sequences to the study of Black Hole dynamical trapping horizons

Non-continuous "jumps" of Apparent Horizons occur generically in 3+1 (binary) black hole evolutions. The dynamical trapping horizon framework suggests a spacetime picture in which these "Apparent Horizon jumps" are understood as spatial cuts of a single spacetime hypersurface foliated by (compact) marginally outer trapped surfaces. We present here some work in progress which makes use of uni-parametric sequences of (axisymmetric) binary black hole initial data for exploring the plausibility of this spacetime picture. The modelling of Einstein evolutions by sequences of initial data has proved to be a successful methodological tool in other settings for the understanding of certain qualitative features of evolutions in restricted physical regimes.Comment: Contribution to the proceedings volume of the Spanish Relativity Meeting 2008: Physics and Mathematics of Gravitation, Salamanca, Spain, 15-19 Sep 200

Memorias I Congreso Internacional. Universidad, desarrollo y cooperación

La participación de la Universidad Politécnica Salesiana, representada por su Rector, en el III Congreso sobre Universidad, Cooperación y Desarrollo, en Madrid, abril de 2006, la publicación n. 8 de la revista Universitas dedicada al tema ¿Qué cooperación para qué desarrollo? y una experiencia generalizada tanto en Ecuador como en América latina de la urgente necesidad de repensar y replantear la Cooperación Internacional desde los Desarrollos Nacionales, fueron los tres precedentes principales para la organización del I Congreso sobre Uni-versidad, Desarrollo y Cooperación. A la iniciativa de organizar dicho Congreso en Cuenca, con motivo de las celebraciones de los 450 años de fundación de la ciudad, junto con la Universidad Politécnica Salesiana, se unieron la Universidad de Cuenca, Universidad del Azuay, Universidad Particular Técnica de Loja, Universidad Santa María de Guayaquil y el Fondo Ecuatoriano Populorum Progressio FEPP. Todo el proyecto contó con el apoyo financiero del Municipio de Cuenca, del Consejo Provincial del Azuay, la Agencia Española de Cooperación Internacional, y de las Universidades participantes. Así mismo el Congreso se benefició del apoyo académico de la Universidad de Murcia. Las tres Conferencias que enmarcaron el Congreso, coincidieron desde enfoques diferentes en una misma estimación de las relaciones entre Cooperación Internacional y Desarrollo Nacional. José de Souza, a partir de la problemática y experiencia de un desarrollo posible en América Latina, hizo un balance crítico no sólo de la Cooperación Internacional respecto de dicho desarrollo, sino también de las relaciones entre países desarrollados y subdesarrollados. Alfonso Moro, tomando como referencia principal las políticas y programas de la cooperación europea con América Latina, puso de manifiesto las relaciones de desigualdad y dependencia impuestas por dicha cooperación, las cuales condicionan y limitan las reales posibilidades de desarrollos autónomos y sostenidos en los países latinoamericanos

Global economic burden of unmet surgical need for appendicitis

Background There is a substantial gap in provision of adequate surgical care in many low- and middle-income countries. This study aimed to identify the economic burden of unmet surgical need for the common condition of appendicitis. Methods Data on the incidence of appendicitis from 170 countries and two different approaches were used to estimate numbers of patients who do not receive surgery: as a fixed proportion of the total unmet surgical need per country (approach 1); and based on country income status (approach 2). Indirect costs with current levels of access and local quality, and those if quality were at the standards of high-income countries, were estimated. A human capital approach was applied, focusing on the economic burden resulting from premature death and absenteeism. Results Excess mortality was 4185 per 100 000 cases of appendicitis using approach 1 and 3448 per 100 000 using approach 2. The economic burden of continuing current levels of access and local quality was US $92 492 million using approach 1 and$73 141 million using approach 2. The economic burden of not providing surgical care to the standards of high-income countries was $95 004 million using approach 1 and$75 666 million using approach 2. The largest share of these costs resulted from premature death (97.7 per cent) and lack of access (97.0 per cent) in contrast to lack of quality. Conclusion For a comparatively non-complex emergency condition such as appendicitis, increasing access to care should be prioritized. Although improving quality of care should not be neglected, increasing provision of care at current standards could reduce societal costs substantially

Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at sNN\sqrt{s_\mathrm{NN}} = 5.02 TeV

Two-particle Bose-Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The data sample, containing 4.27$\times10^{9}$ minimum bias events corresponding to an integrated luminosity of 0.607 nb$^{-1}$, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a L\'evy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the L\'evy index or shape parameter ($\alpha$), the L\'evy scale parameter ($R$), and the correlation strength parameter ($\lambda$). The source shape, characterized by $\alpha$, is found to be neither Cauchy nor Gaussian, implying the need for a full L\'evy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the L\'evy $R$ parameter. The $\lambda$ parameter is studied in terms of the core-halo model.Comment: Submitted to Physical Review C. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-011 (CMS Public Pages