【论文速递】Physicists created a tiny universe and watched time emerge without a clock

英文标题：Physicists created a tiny universe and watched time emerge without a clock

来源：ScienceDaily
原文链接：https://www.sciencedaily.com/releases/2 ... 234703.htm

中文摘要：
Scientists have created a miniature universe in the laboratory that could help answer one of the biggest mysteries in physics: What is time, and where does it come from? Using 24,000 ultracold atoms, a University of Birmingham researcher built an isolated quantum system that repeatedly expands and contracts, mimicking the Big Bang and a possible Big Crunch. Remarkably, the experiment showed that time could emerge from changes happening inside the system, without relying on an external clock.

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