String Compactifications, Supersymmetry Breaking and Hierarchy Problems

弦理论是自然界所有基本力的候选理论，将进行广泛的研究计划。重点将放在构建弦模型，自然适应大层次的规模。这是由弱核力的空间尺度（大约是原子核的大小）和引力变强的尺度（比原子核的大小短得多的距离）之间观察到的但神秘的差异激发的。 这是一个重要的问题，因为理解这两种截然不同的尺度在自然界中是如何以及为什么发生的，可能是揭示基本粒子下一层结构的关键。

A broad program of research in string theory, the candidate theory of allthe basic forces of nature, will be undertaken. The focus will be onconstructing string models which naturally accommodate large hierarchiesof scales. This is motivated by the observed but mysterious discrepancybetween the spatial scale of the weak nuclear force (which is roughly thesize of the nucleus) and the scale at which the gravitational forcebecomes strong (which is a much shorter distance than nuclear sizes). This is an important problem because understanding how and why these twovery disparate scales occur in nature may be a key to uncovering the nextlayer of structure of the elementary particles.