论文标题
关于曲率扰动的（非）保守的注释
A note on the (non-)conservation of curvature perturbation
论文作者
论文摘要
在本说明中，我们比较了宇宙学扰动$ζ$的两个不同定义，这些定义是在大尺度上保守的，并在小规模上研究了它们的不保守。我们通过仅在纵向（共形 - 纽顿）仪表中的计算来得出曲率扰动在均匀密度切片上的时间演变。结果与通过局部保护能量量张量获得的结果是简洁的，并且与获得的结果兼容。
In this note, we compare two different definitions for the cosmological perturbation $ζ$ which is conserved on large scales, and study their non-conservation on small scales. We derive an equation for the time evolution of the curvature perturbation on a uniform density slice through a calculation solely in longitudinal (conformal-Newtonian) gauge. The result is concise and compatible with that obtained via local conservation of energy-momentum tensor.
