Applied string theory

现代理论物理学的一个突出问题是，我们用来描述宇宙中截然不同长度尺度上的物理学的两种框架之间的鲜明对比。量子力学规定了亚原子粒子在最短距离上运动的统计解释。另一方面，爱因斯坦的广义相对论使用时空几何的概念作为解释当前天体物理测量的基础。尽管这两种理论都在其相应的有效性领域中经受了显著的实验检验，但它们明显的差异需要一个更基本的描述：一个从微观到天文距离都有效的统一框架。

An outstanding problem of modern theoretical physics is the striking contrast between two frameworks we use to describe physics at vastly different length scales of our Universe. Quantum mechanics prescribes a statistical interpretation to the motion of subatomic particles at shortest distances. On the other hand, Einstein's theory of general relativity uses the notion of the spacetime geometry as a basic to the interpretation of current astrophysical measurements. Though both theories have sustained remarkable experimental tests in their corresponding realms of validity, their apparent dissimilarity calls for a more fundamental description: a single unifying framework valid from microscopic to astronomical distances.