膨胀宇宙中的宇宙学雷达测距
Cosmological Radar Ranging in an Expanding Universe
摘要：
虽然以广义相对论为基础的现代宇宙学已经有近一个世纪的历史了，但空间膨胀的意义仍在争论之中。在本文中，雷达测距在一个不断膨胀的宇宙中的问题进行了审查，重点是在测距过程中的光旅行时间，它最近声称，这证明了空间的物理膨胀。我们将这个问题推广到考虑一个加速的火箭发动机的回程，表明虽然这符合狭义相对论对空宇宙的预期，但当宇宙包含物质时，会出现明显的差异。我们的结论是，这并不要求空间的膨胀是一种物理现象，相反，当考虑宇宙尺度上的运动时，我们不能忽视物质的影响，这是通过广义相对论定律看到的。
英文摘要：
While modern cosmology, founded in the language of general relativity, is almost a century old, the meaning of the expansion of space is still being debated. In this paper, the question of radar ranging in an expanding universe is examined, focusing upon light travel times during the ranging; it has recently been claimed that this proves that space physically expands. We generalize the problem into considering the return journey of an accelerating rocketeer, showing that while this agrees with expectations of special relativity for an empty universe, distinct differences occur when the universe contains matter. We conclude that this does not require the expansion of space to be a physical phenomenon, rather that we cannot neglect the influence of matter, seen through the laws of general relativity, when considering motions on cosmic scales.
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