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arXiv · 1806.11147

Bispectrum as Baryon Acoustic Oscillation Interferometer

Hillary L. Child·Masahiro Takada·Takahiro Nishimichi·Tomomi Sunayama·Zachary Slepian·Salman Habib·Katrin Heitmann
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Abstract

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.

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Hillary L. Child, Masahiro Takada, Takahiro Nishimichi, Tomomi Sunayama, Zachary Slepian, Salman Habib, Katrin Heitmann. 2018-12-20. Bispectrum as Baryon Acoustic Oscillation Interferometer. https://doi.org/10.1103/physrevd.98.123521

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