论文标题
星系数在扰动理论中按二阶计数计数：一个前阶项比较
Galaxy number counts at second order in perturbation theory: a leading-order term comparison
论文作者
论文摘要
银河数密度是将理论预测与当前和未来大规模结构调查的观察数据进行比较的关键量。这些阶段IV调查要求的精度要求使用二阶宇宙学扰动理论。根据前面发布的独立计算，我们介绍了与其他三个小组领先顺序的结果进行比较的结果。总体而言，我们发现不同方法之间的差异主要在于某些数量的定义，在扰动理论中，符号的歧义导致在二阶添加额外的术语。
The galaxy number density is a key quantity to compare theoretical predictions to the observational data from current and future Large Scale Structure surveys. The precision demanded by these Stage IV surveys requires the use of second order cosmological perturbation theory. Based on the independent calculation published previously, we present the result of the comparison with the results of three other groups at leading order. Overall we find that the differences between the different approaches lie mostly on the definition of certain quantities, where the ambiguity of signs results in the addition of extra terms at second order in perturbation theory.
