Simulations and symmetries
Abstract
ABSTRACT We investigate the range of applicability of a model for the real-space power spectrum based on N-body dynamics and a (quadratic) Lagrangian bias expansion. This combination uses the highly accurate particle displacements that can be efficiently achieved by modern N-body methods with a symmetries-based bias expansion which describes the clustering of any tracer on large scales. We show that at low redshifts, and for moderately biased tracers, the substitution of N-body-determined dynamics improves over an equivalent model using perturbation theory by more than a factor of two in scale, while at high redshifts and for highly biased tracers the gains are more modest. This hybrid approach lends itself well to emulation. By removing the need to identify haloes and subhaloes, and by not requiring any galaxy-formation-related parameters to be included, the emulation task is significantly simplified at the cost of modelling a more limited range in scale.
- Authors:
-
[1];
[1];
[2]
- Department of Physics, University of California, Berkeley, CA 94720, USA
- Department of Physics, University of California, Berkeley, CA 94720, USA, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 93720, USA
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1598918
- Alternate Identifier(s):
- OSTI ID: 1603641
- Grant/Contract Number:
- AC02-05CH11231; DGE 2206400; 1713791
- 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: 492 Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; haloes; statistics; cosmological parameters; cosmology theory; large-scale structure of the Universe
Citation Formats
Modi, Chirag, Chen, Shi-Fan, and White, Martin. Simulations and symmetries. United Kingdom: N. p., 2020.
Web. doi:10.1093/mnras/staa251.
Modi, Chirag, Chen, Shi-Fan, & White, Martin. Simulations and symmetries. United Kingdom. https://doi.org/10.1093/mnras/staa251
Modi, Chirag, Chen, Shi-Fan, and White, Martin. Tue .
"Simulations and symmetries". United Kingdom. https://doi.org/10.1093/mnras/staa251.
@article{osti_1598918,
title = {Simulations and symmetries},
author = {Modi, Chirag and Chen, Shi-Fan and White, Martin},
abstractNote = {ABSTRACT We investigate the range of applicability of a model for the real-space power spectrum based on N-body dynamics and a (quadratic) Lagrangian bias expansion. This combination uses the highly accurate particle displacements that can be efficiently achieved by modern N-body methods with a symmetries-based bias expansion which describes the clustering of any tracer on large scales. We show that at low redshifts, and for moderately biased tracers, the substitution of N-body-determined dynamics improves over an equivalent model using perturbation theory by more than a factor of two in scale, while at high redshifts and for highly biased tracers the gains are more modest. This hybrid approach lends itself well to emulation. By removing the need to identify haloes and subhaloes, and by not requiring any galaxy-formation-related parameters to be included, the emulation task is significantly simplified at the cost of modelling a more limited range in scale.},
doi = {10.1093/mnras/staa251},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 492,
place = {United Kingdom},
year = {2020},
month = {1}
}
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