标题： 隐藏额外维度：弦理论中尺度分离的综述 显示英文标题

标题： Hiding the extra dimensions: A review on scale separation in string theory

摘要： 我们概述了关于弦理论中尺度分离的较早和最新发展。 我们重点介绍在流形紧化到反德西特真空时，在经典层面上获得的参数尺度分离。 我们回顾了从低维视角构建的，旨在实现时空与内部空间之间尺度层次结构的场景。 然后，我们讨论它们如何从适当的高维描述中被理解。 最后，讨论了这些构造的局限性，以及针对弦理论中尺度分离问题的Swampland和全息论证。 综述的目的是描绘该主题当前的最新状况。 显示英文摘要

摘要： We present an overview of both older and recent developments concerning scale separation in string theory. We focus on parametric scale separation obtained at the classical level in flux compactifications down to AdS vacua. We review the scenarios that have been proposed to achieve a hierarchy of scales between spacetime and the internal space, built from a low-dimensional perspective. We then discuss how they have been understood to arise from proper higher-dimensional descriptions. Eventually, limitations of these constructions as well as Swampland and holographic arguments addressing the question of scale separation in string theory are discussed. The purpose of the review is to draw an accurate picture of the state of the art of the subject at the moment.