There can be no doubt that the most important development in string theory in recent years is the discovery of D-branes In flat spacetime a D-brane is regarded as a subspace on which open strings may end.1 Since string theory modifies classical notions of geometry at short distances, it is natural to assume that such a simple picture of a D-brane as a subspace is too naive for more general backgrounds. A more abstract notion of a D-brane is required, one which coincides with the notion of a subspace when viewed in the context of only large distances. The aim of these lectures is to study how this can happen.
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机译：毫无疑问，近年来String理论中最重要的发展是在平坦的间隔中发现D-Branes A D-Brane被认为是一个截止琴弦的子空间，因为字符串理论修改了古典概念几何在短距离下，假设像子空间那样简单的D-Brane的简单图片对于更多的一般背景来说太天真了。需要一种更抽象的D-扁平的概念，其中在仅在大距离的背景下观察时与子空间的概念一致。这些讲座的目的是研究如何发生这种情况。
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