本书暂定概念：尚未进入正式概念库。下面是本书给出的定义原文。
定义 · 4.4 时空的渐近行为
主要想法是作一个共形变换，把无穷远拉到某个更易于处理、距离有限的地方。显然，这个变换会扭曲距离，但它会保留原时空的因果结构。于是我们就能把这一因果结构画在一张非常有限的纸上（比如一张 A4 纸）。这样得到的图称为彭罗斯图(Penrose diagram)，名字取自它的发现者罗杰·彭罗斯和布兰登·卡特。下面我们将用一系列例子来说明这一点。
英文原文
The main idea is to perform a conformal transformation that pulls infinity to some more manageable, finite distance. Obviously this transformation will mangle distances, but it will retain the causal structure of the original spacetime. We can then draw this causal structure on a very finite piece of paper (e.g. A4). The resulting picture is called a Penrose diagram, named after its discoverers, Roger Penrose and Brandon Carter. We will illustrate this with a series of examples.
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