曲率简史
A Brief History of Curvature
摘要：
宇宙流体的应力-能量张量的轨迹，正比于广义相对论中的里奇标量曲率，在宇宙尺度上确定，时间范围从暴胀时代到膨胀宇宙的今天。后暴胀时代和相对论流体的热历史，特别是QCD从渐近自由到禁闭的转变和电弱相变，在标量曲率上留下了重要的印记。这些印记可以是任何一种符号，并且比通过天真地将当前时代的无压物质推回到辐射主导时代所获得的值大几个数量级。
英文摘要：
The trace of the stress-energy tensor of the cosmological fluid, proportional to the Ricci scalar curvature in general relativity, is determined on cosmic scales for times ranging from the inflationary epoch to the present day in the expanding Universe. The post-inflationary epoch and the thermal history of the relativistic fluid, in particular the QCD transition from asymptotic freedom to confinement and the electroweak phase transition, leave significant imprints on the scalar curvature. These imprints can be of either sign and are orders of magnitude larger than the values that would be obtained by naively extrapolating the pressureless matter of the present epoch back into the radiation-dominated epoch.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
