The reconstructed power spectrum in the Zeldovich approximation
The reconstructed power spectrum in the Zeldovich approximation
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通讯作者：
Shi-Fan Chen;Z. Vlah;Martin White
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作者：
Shi-Fan Chen;Z. Vlah;Martin White
.密度重建通过消除非线性结构形成引起的一些平滑来锐化重子声振荡信号。在本文中，我们提出了一个基于Zeldovich近似的重建分析模型，其中第一次包括一套完整的反项和偏置项，最高可达二次阶，并可以在傅立叶和配置空间中在很宽的尺度范围内拟合真实的和红移空间数据重建前和重建后的数据。我们将我们的模型与来自DarkSky模拟[1]的z = 0的n体数据进行比较，在真实的空间和k = 0的红移空间功率谱中发现了亚百分比的一致性。4 h Mpc − 1，输出到k = 0。四极中的2 h Mpc-1，在配置空间中具有可比的一致性。我们比较了我们的模型与几个流行的现有的替代方案，更新现有的理论结果的指数阻尼在摆动/无摆动分裂的BAO信号，并讨论通常被忽视的效果较高的偏置贡献的重建信号。在附录中，我们重新推导出前者在我们的形式主义，目前的探索性结果，由于重建固有的非线性高阶校正，并提出了数值技术，计算红移空间功率谱内的Zeldovich近似偏示踪剂。
. Density-reconstruction sharpens the baryon acoustic oscillations signal by undoing some of the smoothing incurred by nonlinear structure formation. In this paper we present an analytical model for reconstruction based on the Zeldovich approximation, which for the first time includes a complete set of counterterms and bias terms up to quadratic order and can fit real and redshift-space data pre- and post-reconstruction data in both Fourier and configuration space over a wide range of scales. We compare our model to n-body data at z = 0 from the DarkSky simulation [1], finding sub-percent agreement in both real space and in the redshift-space power spectrum monopole out to k = 0 . 4 h Mpc − 1 , and out to k = 0 . 2 h Mpc − 1 in the quadrupole, with comparable agreement in configuration space. We compare our model with several popular existing alternatives, updating existing theoretical results for exponential damping in wiggle/no-wiggle splits of the BAO signal and discuss the usually-ignored effect of higher bias contributions on the reconstructed signal. In the appendices, we re-derive the former within our formalism, present exploratory results on higher-order corrections due to nonlinearities inherent to reconstruction, and present numerical techniques with which to calculate the redshift-space power spectrum of biased tracers within the Zeldovich approximation.