Projectivity of Planar Zeros in Field and String Theory Amplitudes

We study the projective properties of planar zeros of tree-level scattering amplitudes in various theories. Whereas for pure scalar field theories we find that the planar zeros of the five-point amplitude do not enjoy projective invariance, coupling scalars to gauge fields gives rise to tree-level amplitudes whose planar zeros are determined by homogeneous polynomials in the stereographic coordinates labelling the direction of flight of the outgoing particles. In the case of pure gauge theories, this projective structure is generically destroyed if string corrections are taken into account. Scattering amplitudes of two scalars with graviton emission vanish exactly in the planar limit, whereas planar graviton amplitudes are zero for helicity violating configurations. These results are corrected by string effects, computed using the single-valued projection, which render the planar amplitude nonzero. Finally, we discuss how the structure of planar zeros can be derived from the soft limit behavior of the scattering amplitudes.Comment: 39 page, 5 figures. v2: typos corrected. It matches the version published in Journal of High Energy Physic

Tendencias de la Mortalidad en España, 1952-1996. Efecto de la edad, de la cohorte de nacimiento y del periodo de muerte

Proyecto financiado por el Fondo de Investigación Sanitaria FIS 00/306 (EPY 1101/00)En este trabajo pretendemos: 1) actualizar la información sobre tendencias de la mortalidad por cáncer en España; 2) incorporar importantes grupos de causas a este análisis como son las cardiovasculares, neurológicas, procesos transmisibles y causas externas; 3) conocer las tendencias recientes de la mortalidad en España; 4) desarrollar una biblioteca de herramientas que faciliten la aplicación de modelos edad-periodo-cohorte a los datos de incidencia y mortalidad.Índice, Presentación, Introducción, Justificación del uso de modelos edad-período-cohorte en el, Material y métodos, Regresión de Poisson. Modelos edad-período-cohorte, Presentación de resultados, Comentarios generales, Osmond vs Decarli, Causas de mortalidad diferentes de cáncer Homologaciones de causas estudiadas entre las diferentes ediciones de la CIE, Tabla I: Causas o grupo de causas estudiadas, Bibliografía (I) Resultados, Tuberculosis, Enfermedad meningocócica, Septicemia, Cáncer de labio, Cáncer de lengua, Cáncer de glándulas salivares, Cáncer de cavidad bucal, Cáncer de faringe, Cáncer de esófago, Cáncer de estómago Cáncer de intestino delgado, Cáncer de colon y recto, Cáncer de páncreas`, Cáncer de peritoneo, Cáncer de fosas nasales, oído medio y senos, Cáncer de laringe, Cáncer de pulmón, Cáncer de hueso, Cáncer de tejido conjuntivo y otros tejidos blandos, Melanoma maligno cutáneo Otros tumores de la piel, Cáncer de mama en mujeres, Cáncer de útero Cáncer de ovario, Cáncer de otros órganos genitales. Mujeres, Cáncer de próstata, Cáncer de testículo, Cáncer de pene y de otros órganos genitales masculinos, Cáncer de vejiga, Cáncer de riñón y de otros órganos urinarios, Cáncer de sistema nervioso, Cáncer de tiroides Enfermedad de Hodgkin, Linfomas no hodgkinianos, Mieloma múltiple Leucemias, Diabetes mellitus, Psicosis orgánicas senil y presenil Esquizofrenia, Enfermedad de Parkinson, Enfermedad de neurona motora Esclerosis múltiple, Epilepsia, Enfermedad isquémica del corazón Insuficiencia cardíaca, Enfermedad cerebrovacular, Neumonía, Gripe Bronquitis, enfisema y asma, Bronquitis crónica y la no especificada Enfisema, Asma, Cirrosis hepática, Accidentes de tráfico, Envenamiento accidental, Suicidio, Homicidio, Bibliografía (II),Anexo 1. Tasas ajustadas de mortalidad en escala normal y semilogarítmica, Tendencia relativa anual para 1952-1996 y últimos 15 años, 1982-1996, Tasas ajustadas truncadas(0-34, 35-64, >/65), Tasas específicas por grupos de edad, sexo y año (quinquenio), tasas ajustadas y riesgo acumulado 0-74 año

Marine heatwaves drive recurrent mass mortalities in the Mediterranean Sea

Climate change is causing an increase in the frequency and intensity of marine heatwaves (MHWs) and mass mortality events (MMEs) of marine organisms are one of their main ecological impacts. Here, we show that during the 2015–2019 period, the Mediterranean Sea has experienced exceptional thermal conditions resulting in the onset of five consecutive years of widespread MMEs across the basin. These MMEs affected thousands of kilometers of coastline from the surface to 45 m, across a range of marine habitats and taxa (50 taxa across 8 phyla). Significant relationships were found between the incidence of MMEs and the heat exposure associated with MHWs observed both at the surface and across depths. Our findings reveal that the Mediterranean Sea is experiencing an acceleration of the ecological impacts of MHWs which poses an unprecedented threat to its ecosystems' health and functioning. Overall, we show that increasing the resolution of empirical observation is critical to enhancing our ability to more effectively understand and manage the consequences of climate change

Marine heatwaves drive recurrent mass mortalities in the Mediterranean Sea

International audienc

The comparative responsiveness of Hospital Universitario Princesa Index and other composite indices for assessing rheumatoid arthritis activity

Objective To evaluate the responsiveness in terms of correlation of the Hospital Universitario La Princesa Index (HUPI) comparatively to the traditional composite indices used to assess disease activity in rheumatoid arthritis (RA), and to compare the performance of HUPI-based response criteria with that of the EULAR response criteria. Methods Secondary data analysis from the following studies: ACT-RAY (clinical trial), PROAR (early RA cohort) and EMECAR (pre-biologic era long term RA cohort). Responsiveness was evaluated by: 1) comparing change from baseline (Delta) of HUPI with Delta in other scores by calculating correlation coefficients; 2) calculating standardised effect sizes. The accuracy of response by HUPI and by EULAR criteria was analyzed using linear regressions in which the dependent variable was change in global assessment by physician (Delta GDA-Phy). Results Delta HUPI correlation with change in all other indices ranged from 0.387 to 0.791); HUPI's standardized effect size was larger than those from the other indices in each database used. In ACT-RAY, depending on visit, between 65 and 80% of patients were equally classified by HUPI and EULAR response criteria. However, HUPI criteria were slightly more stringent, with higher percentage of patients classified as non-responder, especially at early visits. HUPI response criteria showed a slightly higher accuracy than EULAR response criteria when using Delta GDA-Phy as gold standard. Conclusion HUPI shows good responsiveness in terms of correlation in each studied scenario (clinical trial, early RA cohort, and established RA cohort). Response criteria by HUPI seem more stringent than EULAR's

Alirocumab and cardiovascular outcomes after acute coronary syndrome

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