标题： 增强版膜世界模型中的引力 显示英文标题

标题： Gravity in Enhanced Brane-World Models

摘要： 我们推广并扩展了关于引力局域化的结果，这些结果涉及具有正、负或零宇宙常数的Karch-Randall-Sundrum膜世界。我们通过研究体度规扰动以及通过膜世界全息术重新解释它们来进行这一工作：即一个诱导的高阶导数引力理论，耦合到膜上的截断共形场论（CFT）。然后，我们通过在膜的作用量中添加明确的爱因斯坦-希尔伯特项（即DGP项）来增强这些模型，并通过研究膜的位置和膜上的引力局域化，确立了其耦合常数的界限，在此界限之外该理论会出现病态。最后，我们研究了膜达到边界的情况，并评论了在膜的作用量中加入进一步的高阶导数项的可能性。 显示英文摘要

摘要： We generalize and extend results on the localization of gravity on Karch-Randall-Sundrum brane-worlds with positive, negative, or zero cosmological constant on the brane. We do so both from the study of bulk metric perturbations, and from their reinterpretation through brane-world holography: an induced higher-derivative theory of gravity coupled to a cut-off CFT on the brane. We then enhance these models by adding an explicit Einstein-Hilbert term on the brane action (i.e. a DGP term) and, through studying the brane position and the localization of gravity on the brane, we establish bounds for its coupling constant, beyond which the theory presents pathologies. We finally study the limit in which the brane reaches the boundary, and comment on adding further higher-derivative terms on the brane action.