标题： 异常引起的规范统一和重力局部化理论中的膜/体耦合 显示英文标题

标题： Anomaly-Induced Gauge Unification and Brane/Bulk Couplings in Gravity-Localized Theories

摘要： 最近有提议认为，引力局域化的紧致化可以在不需要层次结构上巨大的额外时空维度的情况下生成所需的规范层次结构。 在本文中，我们表明，在这种情形下，规范耦合统一自然地出现，这是由于膜场波函数重缩放引起的异常。 因此， “由异常引发的”规范耦合统一可以很容易地解释引力局域化紧致化中的表观低能规范耦合。 然而，我们同时也指出这种紧致化存在一些现象学上的困难，包括无法同时容纳大统一尺度和电弱尺度。 我们还表明，这种情形下的膜/体耦合通常太小，无法具有现象学相关性。 最后，我们对这些谜题可能的解决办法进行推测。 显示英文摘要

摘要： It has recently been proposed that gravity-localized compactifications can generate the required gauge hierarchy without the need for hierarchically large extra spacetime dimensions. In this paper, we show that gauge coupling unification arises naturally in such scenarios as a result of the anomaly induced by the rescaling of the wavefunctions of the brane fields. Thus, ``anomaly-induced'' gauge coupling unification can easily explain the apparent low-energy gauge couplings in gravity-localized compactifications. However, we also point out a number of phenomenological difficulties with such compactifications, including an inability to accommodate the GUT scale and the electroweak scale simultaneously. We also show that brane/bulk couplings in this scenario are generically too small to be phenomenologically relevant. Finally, we speculate on possible resolutions to these puzzles.