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Title: An iterative reconstruction of cosmological initial density fields

Abstract

We present an iterative method to reconstruct the linear-theory initial conditions from the late-time cosmological matter density field, with the intent of improving the recovery of the cosmic distance scale from the baryon acoustic oscillations. We present tests using the dark matter density field in both real and redshift space generated from an N-body simulation. In redshift space at z = 0.5, we find that the reconstructed displacement field using our iterative method are more than 80 percent correlated with the true displacement field of the dark matter particles on scales k < 0.10 h Mpc -1. Furthermore, we show that the two-point correlation function of our reconstructed density field matches that of the initial density field substantially better, especially on small scales (<40 h -1 Mpc). Our redshift-space results are improved if we use an anisotropic smoothing so as to account for the reduced small-scale information along the line of sight in redshift space.

Authors:
ORCiD logo [1];  [2]
  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Tohoku Univ., Sendai (Japan)
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540619
Grant/Contract Number:  
SC0013718
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 478; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics

Citation Formats

Hada, Ryuichiro, and Eisenstein, Daniel J. An iterative reconstruction of cosmological initial density fields. United States: N. p., 2018. Web. doi:10.1093/mnras/sty1203.
Hada, Ryuichiro, & Eisenstein, Daniel J. An iterative reconstruction of cosmological initial density fields. United States. doi:10.1093/mnras/sty1203.
Hada, Ryuichiro, and Eisenstein, Daniel J. Fri . "An iterative reconstruction of cosmological initial density fields". United States. doi:10.1093/mnras/sty1203. https://www.osti.gov/servlets/purl/1540619.
@article{osti_1540619,
title = {An iterative reconstruction of cosmological initial density fields},
author = {Hada, Ryuichiro and Eisenstein, Daniel J.},
abstractNote = {We present an iterative method to reconstruct the linear-theory initial conditions from the late-time cosmological matter density field, with the intent of improving the recovery of the cosmic distance scale from the baryon acoustic oscillations. We present tests using the dark matter density field in both real and redshift space generated from an N-body simulation. In redshift space at z = 0.5, we find that the reconstructed displacement field using our iterative method are more than 80 percent correlated with the true displacement field of the dark matter particles on scales k < 0.10 h Mpc-1. Furthermore, we show that the two-point correlation function of our reconstructed density field matches that of the initial density field substantially better, especially on small scales (<40 h-1 Mpc). Our redshift-space results are improved if we use an anisotropic smoothing so as to account for the reduced small-scale information along the line of sight in redshift space.},
doi = {10.1093/mnras/sty1203},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 478,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 6 works
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