Wavy Strings: Black or Bright?

Recent developments in string theory have brought forth a considerable interest in time-dependent hair on extended objects. This novel new hair is typically characterized by a wave profile along the horizon and angular momentum quantum numbers $l,m$ in the transverse space. In this work, we present an extensive treatment of such oscillating black objects, focusing on their geometric properties. We first give a theorem of purely geometric nature, stating that such wavy hair cannot be detected by any scalar invariant built out of the curvature and/or matter fields. However, we show that the tidal forces detected by an infalling observer diverge at the `horizon' of a black string superposed with a vibration in any mode with $l \ge 1$. The same argument applied to longitudinal ($l=0$) waves detects only finite tidal forces. We also provide an example with a manifestly smooth metric, proving that at least a certain class of these longitudinal waves have regular horizons.Comment: 45 pages, latex, no figure

"Nossa Senhora da Help": sexo, turismo e deslocamento transnacional em Copacabana "Our Lady of Help": Sex, tourism and transnational movements in Copacabana

A análise do turismo sexual e o tráfico das mulheres tem concentrada na subjugação das mulheres, situando-as como passivas - objetos de câmbio que são "traficados" entre universos nacionais subordinados e dominantes. Todavia, como Lévi-Strauss advém, as mulheres também são geradoras de símbolos. Baseando nossa análise em trabalhos de campo feito entre turistas sexuais e prostitutas em Copacabana, buscamos demonstrar como a capacidade feminina de criar e manipular símbolos potencializa o movimento internacional de brasileiras e de estrangeiros.<br>Analysis of sexual tourism has concentrated on the subjugation of women as devalued objects of exchange, trafficked between dominant and subordinate national universes. As Lévi-Strauss points out, however, while often understood to be items of exchange, women are also symbol generators in their own right. It is this symbolic-generating capacity that strengthens the international movement of Brazilian women as sexualized objects of exchange. Basing our analysis on fieldwork among tourists and prostitutes in Copacabana, we seek to demonstrate how women's ability to manipulate symbols potentializes the international movement of Brazilian women and foreign men