Cosmological constraints without nonlinear redshift-space distortions
Cosmological constraints without nonlinear redshift-space distortions
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发表时间：
2022
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通讯作者：
M. Ivanov;O. Philcox;M. Simonović;M. Zaldarriaga;T. Nishimichi;M. Takada
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作者：
M. Ivanov;O. Philcox;M. Simonović;M. Zaldarriaga;T. Nishimichi;M. Takada
非线性红移空间扭曲（“上帝的手指”）是具有挑战性的模型分析，这一事实限制了微扰理论的适用性，在红移空间相比，真实的空间。我们展示了如何使用一个新的观察，Q 0，这可以很容易地估计从红移空间聚类数据，近似等于真实的空间功率谱，可以减轻这个问题。新的统计量并不来自上帝的手指，可以用微扰理论精确地描述到k max（cid：39）0。4 h Mpc − 1。它可以直接包括在可能性在可以忽略不计的额外计算成本，并产生显着的改善宇宙学参数相比，标准的功率谱多极分析。使用模拟和观测数据的重子振荡光谱调查，我们表明，改善从10%到100%，这取决于宇宙学参数的考虑，星系样本和调查量。
: Non-linear redshift-space distortions (“fingers of God”) are challenging to model analytically, a fact that limits the applicability of perturbation theory in redshift space as compared to real space. We show how this problem can be mitigated using a new observable, Q 0 , which can be easily estimated from the redshift space clustering data and is approximately equal to the real space power spectrum. The new statistic does not suffer from fingers of God and can be accurately described with perturbation theory down to k max (cid:39) 0 . 4 h Mpc − 1 . It can be straightforwardly included in the likelihood at negligible additional computational cost, and yields noticeable improvements on cosmological parameters compared to standard power spectrum multipole analyses. Using both simulations and observational data from the Baryon Oscillation Spectroscopic Survey, we show that improvements vary from 10% to 100% depending on the cosmological parameter considered, the galaxy sample and the survey volume.