Bispectrum as Baryon Acoustic Oscillation Interferometer
Cosmology and Nongalactic Astrophysics
2018-12-21 v2
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.
Cite
@article{arxiv.1806.11147,
title = {Bispectrum as Baryon Acoustic Oscillation Interferometer},
author = {Hillary L. Child and Masahiro Takada and Takahiro Nishimichi and Tomomi Sunayama and Zachary Slepian and Salman Habib and Katrin Heitmann},
journal= {arXiv preprint arXiv:1806.11147},
year = {2018}
}
Comments
6 pages, 3 figures; revised to match published version