Measuring bias via the consistency relations of the large scale structure
Measuring bias via the consistency relations of the large scale structure
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通过大规模结构的一致性关系测量偏差
DOI：
10.1103/physrevd.100.123537
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发表时间：
2019
影响因子：
5
通讯作者：
Pietroni Massimo
中科院分区：
文献类型：
--
作者：
Marinucci Marco;Nishimichi Takahiro;Pietroni Massimo
大尺度结构的一致性关系是不同阶相关函数之间的精确等式。这些关系源自等价原理，并适用于暴胀的单场模型所产生的原始扰动。它们不受非线性的影响，也适用于有偏的示踪剂和红移空间。我们表明，重子声学振荡的双谱（BS）在压缩极限抑制相对于那些在功率谱的系数，取决于BS配置和偏置参数（和，在红移空间，也对增长率）。我们测试这些关系使用大体积体模拟，并表明它们提供了一种新的方法来测量大规模的晕偏差，并可能，增长率。由于偏差是通过比较两个直接可观测的量获得的，因此该方法在计算方案和基础宇宙学模型上都没有理论上的不确定性。
Consistency relations for the large scale structure are exact equalities between correlation functions of different order. These relations descend from the equivalence principle and hold for primordial perturbations generated by single-field models of inflation. They are not affected by nonlinearities and hold also for biased tracers and in redshift space. We show that baryonic acoustic oscillations in the bispectrum (BS) in the squeezed limit are suppressed with respect to those in the power spectrum by a coefficient that depends on the BS configuration and on the bias parameter (and, in redshift space, also on the growth rate). We test these relations using large volume-body simulations and show that they provide a novel way to measure large scale halo bias and, potentially, the growth rate. Since bias is obtained by comparing two directly observable quantities, the method is free from theoretical uncertainties both on the computational scheme and on the underlying cosmological model.