Modeling iterative reconstruction and displacement field in the large scale structure
Abstract
The next generation of galaxy surveys like the Dark Energy Spectroscopic Instrument and Euclid will provide datasets orders of magnitude larger than anything available to date. Our ability to model nonlinear effects in late time matter perturbations will be a key to unlock the full potential of these datasets, and the area of initial condition reconstruction is attracting growing attention. Iterative reconstruction developed by Marcel Schmittfull et al. is a technique designed to reconstruct the displacement field from the observed galaxy distribution. The nonlinear displacement field and initial linear density field are highly correlated. Therefore, reconstructing the nonlinear displacement field enables us to extract the primordial cosmological information better than from the late time density field at the level of the two-point statistics. This paper will test to what extent the iterative reconstruction can recover the true displacement field and construct a perturbation theory model for the postreconstructed field. We model the iterative reconstruction process with Lagrangian perturbation theory (LPT) up to third order for dark matter in real space and compare it with N-body simulations. Here we find that the simulated iterative reconstruction does not converge to the nonlinear displacement field, and the discrepancy mainly appears in the shiftmore »
- Authors:
-
[1];
[1];
[2];
[3]
- Ohio University, Athens, OH (United States)
- Missouri University of Science and Technology, Rolla, MO (United States); University of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI)
- University of Edinburgh, Scotland (United Kingdom)
- Publication Date:
- Research Org.:
- Ohio Univ., Athens, OH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); World Premier International Research Center Initiative; MEXT, Japan; European Research Council (ERC)
- OSTI Identifier:
- 1979977
- Alternate Identifier(s):
- OSTI ID: 2290345
- Grant/Contract Number:
- SC0019091; 853291
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; cosmological parameters; large scale structure of the universe
Citation Formats
Ota, Atsuhisa, Seo, Hee-Jong, Saito, Shun, and Beutler, Florian. Modeling iterative reconstruction and displacement field in the large scale structure. United States: N. p., 2021.
Web. doi:10.1103/physrevd.104.123508.
Ota, Atsuhisa, Seo, Hee-Jong, Saito, Shun, & Beutler, Florian. Modeling iterative reconstruction and displacement field in the large scale structure. United States. https://doi.org/10.1103/physrevd.104.123508
Ota, Atsuhisa, Seo, Hee-Jong, Saito, Shun, and Beutler, Florian. Thu .
"Modeling iterative reconstruction and displacement field in the large scale structure". United States. https://doi.org/10.1103/physrevd.104.123508. https://www.osti.gov/servlets/purl/1979977.
@article{osti_1979977,
title = {Modeling iterative reconstruction and displacement field in the large scale structure},
author = {Ota, Atsuhisa and Seo, Hee-Jong and Saito, Shun and Beutler, Florian},
abstractNote = {The next generation of galaxy surveys like the Dark Energy Spectroscopic Instrument and Euclid will provide datasets orders of magnitude larger than anything available to date. Our ability to model nonlinear effects in late time matter perturbations will be a key to unlock the full potential of these datasets, and the area of initial condition reconstruction is attracting growing attention. Iterative reconstruction developed by Marcel Schmittfull et al. is a technique designed to reconstruct the displacement field from the observed galaxy distribution. The nonlinear displacement field and initial linear density field are highly correlated. Therefore, reconstructing the nonlinear displacement field enables us to extract the primordial cosmological information better than from the late time density field at the level of the two-point statistics. This paper will test to what extent the iterative reconstruction can recover the true displacement field and construct a perturbation theory model for the postreconstructed field. We model the iterative reconstruction process with Lagrangian perturbation theory (LPT) up to third order for dark matter in real space and compare it with N-body simulations. Here we find that the simulated iterative reconstruction does not converge to the nonlinear displacement field, and the discrepancy mainly appears in the shift term, i.e., the term correlated directly with the linear density field. On the contrary, our 3LPT model predicts that the iterative reconstruction should converge to the nonlinear displacement field. We discuss the sources of discrepancy, including numerical noise/artifacts on small scales, and present an ad hoc phenomenological model that improves the agreement.},
doi = {10.1103/physrevd.104.123508},
journal = {Physical Review. D.},
number = 12,
volume = 104,
place = {United States},
year = {Thu Dec 02 00:00:00 EST 2021},
month = {Thu Dec 02 00:00:00 EST 2021}
}
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