Institute for Theoretical Physics, University of Cologne, Zülpicher Strasse 77, 50937 Köln, Germany.
Philos Trans A Math Phys Eng Sci. 2012 Sep 28;370(1975):4566-75. doi: 10.1098/rsta.2011.0492.
I describe how we can understand the classical appearance of our world from a universal quantum theory. The essential ingredient is the process of decoherence. I start with a general discussion in ordinary quantum theory and then turn to quantum gravity and quantum cosmology. There is a whole hierarchy of classicality from the global gravitational field to the fluctuations in the cosmic microwave background, which serve as the seeds for the structure in the Universe.
我描述了如何从一个统一的量子理论来理解我们的世界的经典外观。基本要素是退相干过程。我从普通量子理论的一般性讨论开始，然后转向量子引力和量子宇宙学。从全局引力场到宇宙微波背景的涨落，存在着一整级别的经典性，它们是宇宙结构的种子。
