Revisiting the analogue of the Jebsen-Birkhoff theorem in Brans-Dicke gravity

We report the explicit form of the general static, spherically symmetric, and asymptotically flat solution of vacuum Brans-Dicke gravity in the Jordan frame, assuming that the Brans-Dicke scalar field has no singularities or zeros (except possibly for a central singularity). This general solution is conformal to the Fisher-Wyman geometry of Einstein theory and its nature depends on a scalar charge parameter. Apart from the Schwarzschild black hole, only wormhole throats and central naked singularities are possibleComment: Discussion expanded and made more precise, credit given to previous references missed in the first version of this preprint, bibliography expanded and updated, and a slight title change. Matches version accepted in Phys. Rev.

La presenza dell'Apocalisse nella cultura italiana ed europea tra medioevo ed eta'presente

Resseguint el tema apocalíptic a través de diversos escrits, l'autor analitza la seva recepció a Itàlia i els eus usos religiosos i laics; tot atenent la relació amb diferents corrents religiosos, herètics i mil·lenarísticsFollowing apocalyptic theme across several tem, the author analyze its reception in Italy and its religious and lay uses; attending to its relation with various religious, heretical and millenaristic movement

A study of the Mg II 2796.34 A emission line in late--type normal, and RS CVn stars

We carry out an analysis of the Mg II 2796.34 A emission line in RS CVn stars and make a comparison with the normal stars studied in a previous paper (Paper I). The sample of RS CVn stars consists of 34 objects with known HIPPARCOS parallaxes and observed at high resolution with IUE. We confirm that RS CVn stars tend to possess wider Mg II lines than normal stars having the same absolute visual magnitude. However, we could not find any correlation between the logarithmic line width log Wo and the absolute visual magnitude Mv (the Wilson--Bappu relationship) for these active stars, contrary to the case of normal stars addressed in Paper I. On the contrary, we find that a strong correlation exists in the (Mv, log L) plane (L is the absolute flux in the line). In this plane, normal and RS CVn stars are distributed along two nearly parallel straight lines with RS CVn stars being systematically brighter by about 1 dex. Such a diagram provides an interesting tool to discriminate active from normal stars. We finally analyse the distribution of RS CVn and of normal stars in the (log L, log Wo) plane, and find a strong linear correlation for normal stars, which can be used for distance determinations.Comment: 10 pages, 7 figures, latex, to be published in A&

Cultural policies and patrimony in Ciudad de Rosario, Argentina

A nivel internacional, se propagan congresos, seminarios y estudios sobre política cultural considerados junto a temas económicos y políticos. Asimismo, a partir de la década de 1960 se registra una construcción institucional de las áreas culturales, con la creación de nuevas dependencias estatales abocadas a su tratamiento. En este sentido, la ciudad de Rosario, no ha quedado exenta de procesos como los registrados en otros contextos latinoamericanos o argentinos. El propósito de este artículo es compartir aspectos de una investigación socioantropológica sobre las principales tendencias en materia de política cultural y sus vinculaciones con la noción de patrimonio en la mencionada ciudad.Internationally, there is a proliferation of conferences, seminaries and studies regarding cultural policy considered along with economic and political issues. As well, beginning in the 1960´s there has been a notable institutional construction of cultural areas, with the creation of new state agencies to deal with them. In this sense, Ciudad de Rosario has not been exempt from processes such as those recorded in other contexts in Argentina and Latin America. The purpose of this article is to share aspects of a socio-anthropological research on major trends in cultural policy and its links with the notion of heritage in the mentioned city.Fil: Cardini, Laura Ana. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Escuela de Antropologia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin