科研之友
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摘要
Pick an arbitrary timelike geodesic in an arbitrary spacetime. We shall demonstrate that there is a particular limiting process, an 'ultra-local limit', in which the immediate tube-like neighbourhood of the timelike geodesic can be 'blown up' to yield a general (typically non-diagonal) Bianchi-type I spacetime. This process shares some (but definitely not all) of the features of the Penrose limit, whereby the immediate tube-like neighbourhood of an arbitrary null geodesic is 'blown up' to yield a pp-wave as a limit.
- 出版日期2011-3-7
