Dark energy perturbations in N-body simulations

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Dark energy perturbations in N-body simulations. / Dakin, Jeppe; Hannestad, Steen; Tram, Thomas; Knabenhans, Mischa; Stadel, Joachim.

In: Journal of Cosmology and Astroparticle Physics, No. 8, 013, 12.08.2019.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

Dakin, J, Hannestad, S, Tram, T, Knabenhans, M & Stadel, J 2019, 'Dark energy perturbations in N-body simulations', Journal of Cosmology and Astroparticle Physics, no. 8, 013. https://doi.org/10.1088/1475-7516/2019/08/013

APA

Dakin, J., Hannestad, S., Tram, T., Knabenhans, M., & Stadel, J. (2019). Dark energy perturbations in N-body simulations. Journal of Cosmology and Astroparticle Physics, (8), [013]. https://doi.org/10.1088/1475-7516/2019/08/013

CBE

Dakin J, Hannestad S, Tram T, Knabenhans M, Stadel J. 2019. Dark energy perturbations in N-body simulations. Journal of Cosmology and Astroparticle Physics. (8). https://doi.org/10.1088/1475-7516/2019/08/013

MLA

Dakin, Jeppe et al. "Dark energy perturbations in N-body simulations". Journal of Cosmology and Astroparticle Physics. 2019. (8). https://doi.org/10.1088/1475-7516/2019/08/013

Vancouver

Dakin J, Hannestad S, Tram T, Knabenhans M, Stadel J. Dark energy perturbations in N-body simulations. Journal of Cosmology and Astroparticle Physics. 2019 Aug 12;(8). 013. https://doi.org/10.1088/1475-7516/2019/08/013

Author

Dakin, Jeppe ; Hannestad, Steen ; Tram, Thomas ; Knabenhans, Mischa ; Stadel, Joachim. / Dark energy perturbations in N-body simulations. In: Journal of Cosmology and Astroparticle Physics. 2019 ; No. 8.

Bibtex

@article{f2c4fc52447649e791fa52d6032d804e,
title = "Dark energy perturbations in N-body simulations",
abstract = "We present N-body simulations which are fully compatible with general relativity, with dark energy consistently included at both the background and perturbation level. We test our approach for dark energy parameterised as both a fluid, and using the parameterised post-Friedmann (PPF) formalism. In most cases, dark energy is very smooth relative to dark matter so that its leading effect on structure formation is the change to the background expansion rate. This can be easily incorporated into Newtonian N-body simulations by changing the Friedmann equation. However, dark energy perturbations and relativistic corrections can lead to differences relative to Newtonian N-body simulations at the tens of percent level for scales k < (10-3-10-2) Mpc-1, and given the accuracy of upcoming large scale structure surveys such effects must be included. In this paper we will study both effects in detail and highlight the conditions under which they are important. We also show that our N-body simulations exactly reproduce the results of the Boltzmann solver CLASS for all scales which remain linear.",
keywords = "cosmological simulations, dark energy theory, dark matter simulations, power spectrum",
author = "Jeppe Dakin and Steen Hannestad and Thomas Tram and Mischa Knabenhans and Joachim Stadel",
year = "2019",
month = "8",
day = "12",
doi = "10.1088/1475-7516/2019/08/013",
language = "English",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "8",

}

RIS

TY - JOUR

T1 - Dark energy perturbations in N-body simulations

AU - Dakin, Jeppe

AU - Hannestad, Steen

AU - Tram, Thomas

AU - Knabenhans, Mischa

AU - Stadel, Joachim

PY - 2019/8/12

Y1 - 2019/8/12

N2 - We present N-body simulations which are fully compatible with general relativity, with dark energy consistently included at both the background and perturbation level. We test our approach for dark energy parameterised as both a fluid, and using the parameterised post-Friedmann (PPF) formalism. In most cases, dark energy is very smooth relative to dark matter so that its leading effect on structure formation is the change to the background expansion rate. This can be easily incorporated into Newtonian N-body simulations by changing the Friedmann equation. However, dark energy perturbations and relativistic corrections can lead to differences relative to Newtonian N-body simulations at the tens of percent level for scales k < (10-3-10-2) Mpc-1, and given the accuracy of upcoming large scale structure surveys such effects must be included. In this paper we will study both effects in detail and highlight the conditions under which they are important. We also show that our N-body simulations exactly reproduce the results of the Boltzmann solver CLASS for all scales which remain linear.

AB - We present N-body simulations which are fully compatible with general relativity, with dark energy consistently included at both the background and perturbation level. We test our approach for dark energy parameterised as both a fluid, and using the parameterised post-Friedmann (PPF) formalism. In most cases, dark energy is very smooth relative to dark matter so that its leading effect on structure formation is the change to the background expansion rate. This can be easily incorporated into Newtonian N-body simulations by changing the Friedmann equation. However, dark energy perturbations and relativistic corrections can lead to differences relative to Newtonian N-body simulations at the tens of percent level for scales k < (10-3-10-2) Mpc-1, and given the accuracy of upcoming large scale structure surveys such effects must be included. In this paper we will study both effects in detail and highlight the conditions under which they are important. We also show that our N-body simulations exactly reproduce the results of the Boltzmann solver CLASS for all scales which remain linear.

KW - cosmological simulations, dark energy theory, dark matter simulations, power spectrum

UR - http://www.scopus.com/inward/record.url?scp=85072131376&partnerID=8YFLogxK

U2 - 10.1088/1475-7516/2019/08/013

DO - 10.1088/1475-7516/2019/08/013

M3 - Journal article

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 8

M1 - 013

ER -