Bispectrum as baryon acoustic oscillation interferometer
Bispectrum as baryon acoustic oscillation interferometer
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DOI：
10.1103/physrevd.98.123521
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发表时间：
2018-06
影响因子：
5
通讯作者：
Hillary L. Child;M. Takada;T. Nishimichi;Tomomi Sunayama;Z. Slepian;S. Habib;K. Heitmann
中科院分区：
文献类型：
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作者：
Hillary L. Child;M. Takada;T. Nishimichi;Tomomi Sunayama;Z. Slepian;S. Habib;K. Heitmann
作者：Child，HL；高田，M；西道，T；砂山，T；斯莱皮安，Z；哈比卜，S；海特曼，K |摘要：© 2018 美国物理学会。星系双谱测量星系三联体的过度聚集，通过重子声振荡（BAO）提供暗能量探测。然而到目前为止，由于三角形的组合数量呈爆炸性增长，它的使用严重不足。在这里，我们利用双谱中的干扰来识别放大 BAO 的三角形。这种方法降低了估计协方差矩阵的计算成本，改进了 BAO 约束，相当于将 BOSS 延长了 30%，并简化了将双谱 BAO 信息添加到未来大规模红移勘测分析的过程。
Author(s): Child, HL; Takada, M; Nishimichi, T; Sunayama, T; Slepian, Z; Habib, S; Heitmann, K | Abstract: © 2018 American Physical Society. The galaxy bispectrum, measuring excess clustering of galaxy triplets, offers a probe of dark energy via baryon acoustic oscillations (BAOs). However up to now it has been severely underused due to the combinatorically explosive number of triangles. Here we exploit interference in the bispectrum to identify triangles that amplify BAOs. This approach reduces the computational cost of estimating covariance matrices, offers an improvement in BAO constraints equivalent to lengthening BOSS by 30% and simplifies adding bispectrum BAO information to future large-scale redshift survey analyses.