标题： 宇宙膨胀与时间的本质 显示英文标题

标题： Cosmological Inflation and the Nature of Time

摘要： 近年来，在观测宇宙学方面的进展正在改变我们对时间本质的看法。 在广义相对论中，选择时间超曲面的自由度阻碍了理论的应用。 幸运的是， 哈密顿-雅可比理论使得人们能够同等看待所有的时 间超曲面。 通过空间曲率幂级数展开，人们可以在半经典近似下求解波函数。 以此方式，人们可以方便地比较各种膨胀模型的预测与微波背景各向异性和星系聚类的观测结果。 显示英文摘要

摘要： Recent advances in observational cosmology are changing the way we view the nature of time. In general relativity, the freedom in choosing a time hypersurface has hampered the implementation of the theory. Fortunately, Hamilton-Jacobi theory enables one to describe all time hypersurfaces on an equal footing. Using an expansion in powers of the spatial curvature, one may solve for the wavefunctional in a semiclassical approximation. In this way, one may readily compare predictions of various inflation models with observations of microwave background anisotropies and galaxy clustering.