Widely accepted theories in modern cosmology say that spacetime is probably infinite. This raises the question how to define a social welfare order (SWO) for an infinite population of people dispersed throughout time and space. Any such SWO should be Lorentz invariant: it should yield the same value independent of the position and velocity of the social observer. I define and axiomatically characterize spatiotemporal Cesàro average utilitarian SWOs as a solution to this problem.

中文翻译：

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相对论时空中的塞萨罗平均功利主义

现代宇宙学中广泛接受的理论认为时空可能是无限的。这就提出了如何为分散在时间和空间中的无限人口定义社会福利秩序（SWO）的问题。任何这样的 SWO 都应该是洛伦兹不变的：它应该产生相同的值，而与社会观察者的位置和速度无关。我定义并公理地描述了时空切萨罗平均功利主义SWO，作为该问题的解决方案。