Discreteness effects in ACDM simulations : A wavelet-statistical view
(2008) In Astrophysical Journal 686(1). p.1-12- Abstract
The effects of particle discreteness in N-body ACDM simulations are still an intensively debated issue. In this paper we explore such effects, taking into account the scatter caused by the randomness of the initial conditions and focusing on the statistical properties of the cosmological density field. For this purpose, we run large sets of ACDM simulations and analyze them using a wide variety of diagnostics, including new and powerful wavelet statistics. Among other facts, we point out (1) that dynamical evolution does not propagate discreteness noise up from the small scales at which it is introduced and (2) that one should aim to satisfy the condition ε ∼ 2d, where e is the force resolution and d is the inter-particle distance. We... (More)
The effects of particle discreteness in N-body ACDM simulations are still an intensively debated issue. In this paper we explore such effects, taking into account the scatter caused by the randomness of the initial conditions and focusing on the statistical properties of the cosmological density field. For this purpose, we run large sets of ACDM simulations and analyze them using a wide variety of diagnostics, including new and powerful wavelet statistics. Among other facts, we point out (1) that dynamical evolution does not propagate discreteness noise up from the small scales at which it is introduced and (2) that one should aim to satisfy the condition ε ∼ 2d, where e is the force resolution and d is the inter-particle distance. We clarify what such a condition means and how to implement it in modern cosmological codes.
(Less)
- author
- Romeo, Alessandro B. ; Agertz, Oscar LU ; Moore, Ben and Stadel, Joachim
- publishing date
- 2008-10-10
- type
- Contribution to journal
- publication status
- published
- keywords
- Cosmology: Miscellaneous, Dark matter, Lale structure of universe, Methods: N-body simulations, Methods: Numerical, Methods: Statistical
- in
- Astrophysical Journal
- volume
- 686
- issue
- 1
- pages
- 12 pages
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:53949123764
- ISSN
- 0004-637X
- DOI
- 10.1086/591236
- language
- English
- LU publication?
- no
- id
- 0273723c-429f-4d81-9829-2f0b6207f176
- date added to LUP
- 2019-02-07 11:24:08
- date last changed
- 2022-03-17 21:25:45
@article{0273723c-429f-4d81-9829-2f0b6207f176,
abstract = {{<p>The effects of particle discreteness in N-body ACDM simulations are still an intensively debated issue. In this paper we explore such effects, taking into account the scatter caused by the randomness of the initial conditions and focusing on the statistical properties of the cosmological density field. For this purpose, we run large sets of ACDM simulations and analyze them using a wide variety of diagnostics, including new and powerful wavelet statistics. Among other facts, we point out (1) that dynamical evolution does not propagate discreteness noise up from the small scales at which it is introduced and (2) that one should aim to satisfy the condition ε ∼ 2d, where e is the force resolution and d is the inter-particle distance. We clarify what such a condition means and how to implement it in modern cosmological codes.</p>}},
author = {{Romeo, Alessandro B. and Agertz, Oscar and Moore, Ben and Stadel, Joachim}},
issn = {{0004-637X}},
keywords = {{Cosmology: Miscellaneous; Dark matter; Lale structure of universe; Methods: N-body simulations; Methods: Numerical; Methods: Statistical}},
language = {{eng}},
month = {{10}},
number = {{1}},
pages = {{1--12}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{Discreteness effects in ACDM simulations : A wavelet-statistical view}},
url = {{http://dx.doi.org/10.1086/591236}},
doi = {{10.1086/591236}},
volume = {{686}},
year = {{2008}},
}