按作者与版本查阅
以下按已登记位置排列。出现顺序、原文引用与已登记依赖分别展示;最早位置不代表全书首次定义。
Szekeres · source-snapshot-bc3404156f6e
已登记出处中的最早位置:§9.3 · zh-CN。
来源短摘录与定位
§9.3 · zh-CN · translation · unreviewed
参数曲线在处称为类时、类空或类光,如果其在处的切4-向量分别为类时、类空或类光。假设物质粒子的路径在其经过的所有事件处均为类时,并且常被称为该粒子的世界线(world-line)(见图9.2)。这一假设等价于要求粒子的速度始终小于,因为
§9.3 · en · original_transcription · unreviewed
The parametrized curve is called timelike, spacelike or null at if its tangent 4- vector at is timelike, spacelike or null, respectively. The path of a material particle wil be assumed to be timelike at all events through which it passes, and is frequently referred to as the particle’s world-line (see Fig. 9.2). This assumption amounts to the requirement that the particle’s velocity is always less than , for