Generating approximate halo catalogues for blind challenges in precision cosmology
Abstract
We present a method for generating suites of dark matter halo catalogues with only a few Nbody simulations, focusing on making small changes to the underlying cosmology of a simulation with high precision. In the context of blind challenges, this allows us to reuse a simulation by giving it a new cosmology after the original cosmology is revealed. Starting with full Nbody realizations of an original cosmology and a target cosmology, we fit a transfer function that displaces haloes in the original so that the galaxy/HOD power spectrum matches that of the target cosmology. This measured transfer function can then be applied to a new realization of the original cosmology to create a new realization of the target cosmology. For a 1 percent change in σ_{8}, we achieve 0.1 percent accuracy to $$k = 1\, h\, \mathrm{Mpc}^{1}$$ in the realspace power spectrum; this degrades to 0.3 percent when the transfer function is applied to a new realization. Here, we achieve similar accuracy in the redshiftspace monopole and quadrupole. In all cases, the result is better than the sample variance of our $$1.1\, h^{1}\, \mathrm{Gpc}$$ simulation boxes.
 Authors:

 HarvardSmithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
 Publication Date:
 Research Org.:
 Harvard Univ., Cambridge, MA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC); National Science Foundation (NSF)
 OSTI Identifier:
 1498594
 Alternate Identifier(s):
 OSTI ID: 1612028
 Grant/Contract Number:
 SC0013718; AST1313285
 Resource Type:
 Published Article
 Journal Name:
 Monthly Notices of the Royal Astronomical Society
 Additional Journal Information:
 Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 485 Journal Issue: 2; Journal ID: ISSN 00358711
 Publisher:
 Royal Astronomical Society
 Country of Publication:
 United Kingdom
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; methods: numerical; largescale structure of Universe
Citation Formats
Garrison, Lehman H., and Eisenstein, Daniel J. Generating approximate halo catalogues for blind challenges in precision cosmology. United Kingdom: N. p., 2019.
Web. https://doi.org/10.1093/mnras/stz600.
Garrison, Lehman H., & Eisenstein, Daniel J. Generating approximate halo catalogues for blind challenges in precision cosmology. United Kingdom. https://doi.org/10.1093/mnras/stz600
Garrison, Lehman H., and Eisenstein, Daniel J. Sat .
"Generating approximate halo catalogues for blind challenges in precision cosmology". United Kingdom. https://doi.org/10.1093/mnras/stz600.
@article{osti_1498594,
title = {Generating approximate halo catalogues for blind challenges in precision cosmology},
author = {Garrison, Lehman H. and Eisenstein, Daniel J.},
abstractNote = {We present a method for generating suites of dark matter halo catalogues with only a few Nbody simulations, focusing on making small changes to the underlying cosmology of a simulation with high precision. In the context of blind challenges, this allows us to reuse a simulation by giving it a new cosmology after the original cosmology is revealed. Starting with full Nbody realizations of an original cosmology and a target cosmology, we fit a transfer function that displaces haloes in the original so that the galaxy/HOD power spectrum matches that of the target cosmology. This measured transfer function can then be applied to a new realization of the original cosmology to create a new realization of the target cosmology. For a 1 percent change in σ8, we achieve 0.1 percent accuracy to $k = 1\, h\, \mathrm{Mpc}^{1}$ in the realspace power spectrum; this degrades to 0.3 percent when the transfer function is applied to a new realization. Here, we achieve similar accuracy in the redshiftspace monopole and quadrupole. In all cases, the result is better than the sample variance of our $1.1\, h^{1}\, \mathrm{Gpc}$ simulation boxes.},
doi = {10.1093/mnras/stz600},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 485,
place = {United Kingdom},
year = {2019},
month = {3}
}
https://doi.org/10.1093/mnras/stz600
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