Bulk Viscosity of dual Fluid at Finite Cutoff Surface via Gravity/Fluid correspondence in Einstein-Maxwell Gravity

Based on the previous paper arXiv:1207.5309, we investigate the possibility to find out the bulk viscosity of dual fluid at the finite cutoff surface via gravity/fluid correspondence in Einstein-Maxwell gravity. We find that if we adopt new conditions to fix the undetermined parameters contained in the stress tensor and charged current of the dual fluid, two new terms appear in the stress tensor of the dual fluid. One new term is related to the bulk viscosity term, while the other can be related to the perturbation of energy density. In addition, since the parameters contained in the charged current are the same, the charged current is not changed.Comment: 15 pages, no figure, typos corrected, new references and comments added, version accepted by PL

A Predictive Analysis on Group Exercise of Chinese Rhythmic Gymnastics at the 2008 Olympic

This article has conducted a compared analysis on skills of top 6 teams at the 2006 and 2007 World Rhythmic Gymnastics Championships, and “Luck Beijing” International Invitation Match by using documents, video tapes, and statistic methods. The results show that the Chinese team has already been in the position of first level in the World and has a potential capability to be in the top 3 teams at the 2008 Olympic. However, the quality of skill execution, skill value, and art value need to be improved and renovated. Keyword: Rhythmic gymnastics, group exercise, the 29th Olympics, China, skill strength, foreground Résumé: En utilisant plusieurs méthodes de recherche, notamment en étudiant des documentations, des vidéo et des statistiques, on a fait des analyses et des comparaisions sur la technique des six premières équipes de la Coupe du monde 2006, du Championnat international de 2007 et du Tournoi international à invitation de “Good Luck Beijing“, dont le résultat montre bien que l’équipe chinoise s’est qualifiée parmi les équipes les plus compétentes du monde et qu’elle a la possibilité de gagner une médaille aux Jeux Olympiques. Pourtant, il faut faire attention à la qualité de l’semble des mouvements, à la valeur technique et artistique. Mots-clés: gymnastique rythmique, compétition en équipe, 29ème Jeux Olympiques, Chine, niveau technique, perspective 摘 要: 通過文獻資料、錄影、數理統計與比較研究方法，對2006年藝術體操世界盃系列賽、2007年世界錦標賽和“好運北京”國際邀請賽集體項目前六名隊伍的技術進行比較分析，結果表明：中國藝術體操集體項目已具有世界一流水平和爭奪 08年奧運會前3名的實力，但是，在成套動作完成品質、技術價值和藝術價值方面有待進一步加強和突破。 關鍵詞: 藝術體操；集體專案；29屆奧運會；中國；技術實力；前

UV-finite scalar field theory with unitarity

In this paper we show how to define the UV completion of a scalar field theory such that it is both UV-finite and perturbatively unitary. In the UV completed theory, the propagator is an infinite sum of ordinary propagators. To eliminate the UV divergences, we choose the coefficients and masses in the propagator to satisfy certain algebraic relations, and define the infinite sums involved in Feynman diagram calculation by analytic continuation. Unitarity can be proved relatively easily by Cutkosky's rules. The theory is equivalent to infinitely many particles with specific masses and interactions. We take the $\phi^4$ theory as an example and demonstrate our idea through explicit Feynman diagram computation.Comment: 14 pages, references adde