宇宙学扰动理论中的次主导微扰
Next-to-leading resummations in cosmological perturbation theory
摘要：
在宇宙学扰动理论中，最好的结果之一是由Crocce和Scoccimarro对传播子得到的大动量主导修正的解析解。使用一个精确的演化方程，我们推广了这一结果，通过表明，一类次领先的修正也可以在所有的订单微扰理论。新的修正修改了百分之几的传播在重子声学振荡范围内的尺度，因此不能被忽视的remation计划，旨在与未来一代星系调查的准确性兼容。可以采用类似的工具来导出功率谱的改进近似。
英文摘要：
One of the nicest results in cosmological perturbation theory is the analytical resummaton of the leading corrections at large momentum, which was obtained by Crocce and Scoccimarro for the propagator. Using an exact evolution equation, we generalize this result, by showing that a class of next-to-leading corrections can also be resummed at all orders in perturbation theory. The new corrections modify the propagator by a few percent in the Baryonic Acoustic Oscillation range of scales, and therefore cannot be neglected in resummation schemes aiming at an accuracy compatible with future generation galaxy surveys. Similar tools can be employed to derive improved approximations for the Power Spectrum.
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