Isobaric Reconstruction of the Baryonic Acoustic Oscillation

doi:10.3847/2041-8213/aa738c

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	Isobaric Reconstruction of the Baryonic Acoustic Oscillation
	Wang,Xin 1; Yu,Hao-Ran 1,10; Zhu,Hong-Ming 8,9; Yu,Yu 7; Pan,Qiaoyin 6; Pen,Ue-Li 1,2,3,4,5
刊名	The Astrophysical Journal Letters
	2017-06-01
卷号	841 期号:2
关键词	large-scale structure of universe
ISSN号	2041-8205
DOI	10.3847/2041-8213/aa738c
英文摘要	Abstract In this Letter, we report a significant recovery of the linear baryonic acoustic oscillation (BAO) signature by applying the isobaric reconstruction algorithm to the nonlinear matter density field. Assuming only the longitudinal component of the displacement being cosmologically relevant, this algorithm iteratively solves the coordinate transform between the Lagrangian and Eulerian frames without requiring any specific knowledge of the dynamics. For dark matter field, it produces the nonlinear displacement potential with very high fidelity. The reconstruction error at the pixel level is within a few percent and is caused only by the emergence of the transverse component after the shell-crossing. As it circumvents the strongest nonlinearity of the density evolution, the reconstructed field is well described by linear theory and immune from the bulk-flow smearing of the BAO signature. Therefore, this algorithm could significantly improve the measurement accuracy of the sound horizon scale s. For a perfect large-scale structure survey at redshift zero without Poisson or instrumental noise, the fractional error is reduced by a factor of ～2.7, very close to the ideal limit with the linear power spectrum and Gaussian covariance matrix.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:2041-8205-841-2-AA738C
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32121]
专题	中国科学院上海天文台
作者单位	1.Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, ON M5H 3H8, Canada; xwang@cita.utoronto.ca 2.Center of High Energy Physics, Peking University, Beijing 100871, China 3.Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, ON N2L 2Y5, Canada 4.Canadian Institute for Advanced Research, CIFAR Program in Gravitation and Cosmology, Toronto, ON M5G 1Z8, Canada 5.Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada 6.School of Physics, Nankai University, 94 Weijin Road, Nankai, Tianjin 300071, China 7.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China 8.University of Chinese Academy of Sciences, Beijing 100049, China 9.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100012, China 10.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
推荐引用方式 GB/T 7714	Wang,Xin,Yu,Hao-Ran,Zhu,Hong-Ming,et al. Isobaric Reconstruction of the Baryonic Acoustic Oscillation[J]. The Astrophysical Journal Letters,2017,841(2).
APA	Wang,Xin,Yu,Hao-Ran,Zhu,Hong-Ming,Yu,Yu,Pan,Qiaoyin,&Pen,Ue-Li.(2017).Isobaric Reconstruction of the Baryonic Acoustic Oscillation.The Astrophysical Journal Letters,841(2).
MLA	Wang,Xin,et al."Isobaric Reconstruction of the Baryonic Acoustic Oscillation".The Astrophysical Journal Letters 841.2(2017).