迷失在对数多项式展开中：对arXiv的评论：2101.08278
Lost in the Log-Polynomial Expansion: Comment on arXiv:2101.08278
摘要：
在[1]中，我们强调了这样一个事实，即Nature Astron. 3，no.3，272-277（2019）[2]中采用的对数多项式展开对平坦$Λ$ CDM的近似性较差，因此使用它来推断平坦$Λ$ CDM的偏差并不合理。最近在arXiv：2101.08278 [3]中提出的“正交对数多项式”是对早期批评[1]的回应。在这里，我们证明了这种新技术[3] --尽管它可能很有趣--未能解决[1]中提出的基本问题。不幸的是，在[2]中提出的主张仍然可能在扩展中丢失。
英文摘要：
In [1] we highlighted the fact that the log polynomial expansion employed in Nature Astron. 3, no.3, 272-277 (2019) [2] is a poor approximation to flat $Λ$CDM, so using it to infer deviations from flat $Λ$CDM is not well-motivated. The "orthogonalized logarithmic polynomials" recently presented in arXiv:2101.08278 [3] are an attempt to respond to the earlier criticism [1]. Here we demonstrate that this new technique [3] - interesting though it may be - fails to address the fundamental problem raised in [1]. Unfortunately, the claim made in [2] may still be lost in the expansion.
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