Model-independent constraints on dark energy and modified gravity with the SKA

Gong-Bo Zhao; David Bacon; Roy Maartens; Mario Santos; Alvise Raccanelli

Model-independent constraints on dark energy and modified gravity with the SKA

Gong-Bo Zhao, David Bacon, Roy Maartens, Mario Santos, Alvise Raccanelli

Institute of Cosmology & Gravitation

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Abstract

Employing a nonparametric approach of the principal component analysis (PCA), we forecast the future constraint on the equation of state w(z) of dark energy, and on the effective Newton constant µ(k, z), which parameterise the effect of modified gravity, using the planned SKA HI galaxy survey. Combining with the simulated data of Planck and Dark Energy Survey (DES), we find that SKA Phase 1 (SKA1) and SKA Phase 2 (SKA2) can well constrain 3 and 5 eigenmodes of w(z) respectively. The errors of the best measured modes can be reduced to 0.04 and 0.023 for SKA1 and SKA2 respectively, making it possible to probe dark energy dynamics. On the other hand, SKA1 and SKA2 can constrain 7 and 20 eigenmodes of µ(k, z) respectively within 10% sensitivity level. Furthermore, 2 and 7 modes can be constrained within sub percent level using SKA1 and SKA2 respectively. This is a significant improvement compared to the combined
datasets without SKA.

Original language	English
Title of host publication	Advancing Astrophysics with the Square Kilometre Array
Publisher	Proceedings of Science
Publication status	Published - 15 Jan 2015
Event	Advancing Astrophysics with the Square Kilometre Array - Giardini Naxos, Italy Duration: 9 Jun 2014 → 13 Jun 2014

Conference

Conference	Advancing Astrophysics with the Square Kilometre Array
Country/Territory	Italy
City	Giardini Naxos
Period	9/06/14 → 13/06/14

Keywords

astro-ph.CO
RCUK
STFC
ST/K0090X/1

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Model-independent constraints on dark energy and modified gravity with the SKAFinal published version, 534 KBLicence: CC BY-NC-SA

http://pos.sissa.it/cgi-bin/reader/contribution.cgi?id=215/165

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@inproceedings{c8101f6eb0054d2db09267eb807ad371,

title = "Model-independent constraints on dark energy and modified gravity with the SKA",

abstract = "Employing a nonparametric approach of the principal component analysis (PCA), we forecast the future constraint on the equation of state w(z) of dark energy, and on the effective Newton constant µ(k, z), which parameterise the effect of modified gravity, using the planned SKA HI galaxy survey. Combining with the simulated data of Planck and Dark Energy Survey (DES), we find that SKA Phase 1 (SKA1) and SKA Phase 2 (SKA2) can well constrain 3 and 5 eigenmodes of w(z) respectively. The errors of the best measured modes can be reduced to 0.04 and 0.023 for SKA1 and SKA2 respectively, making it possible to probe dark energy dynamics. On the other hand, SKA1 and SKA2 can constrain 7 and 20 eigenmodes of µ(k, z) respectively within 10% sensitivity level. Furthermore, 2 and 7 modes can be constrained within sub percent level using SKA1 and SKA2 respectively. This is a significant improvement compared to the combineddatasets without SKA.",

keywords = "astro-ph.CO, RCUK, STFC, ST/K0090X/1",

author = "Gong-Bo Zhao and David Bacon and Roy Maartens and Mario Santos and Alvise Raccanelli",

note = "13 pages, 5 figures. The wrongly generated last page was removed. This article is part of the 'SKA Cosmology Chapter, Advancing Astrophysics with the SKA (AASKA14), Conference, Giardini Naxos (Italy), June 9th-13th 2014'; Advancing Astrophysics with the Square Kilometre Array ; Conference date: 09-06-2014 Through 13-06-2014",

year = "2015",

month = jan,

day = "15",

language = "English",

booktitle = "Advancing Astrophysics with the Square Kilometre Array",

publisher = "Proceedings of Science",

}

Zhao, G-B, Bacon, D, Maartens, R, Santos, M & Raccanelli, A 2015, Model-independent constraints on dark energy and modified gravity with the SKA. in Advancing Astrophysics with the Square Kilometre Array. Proceedings of Science, Advancing Astrophysics with the Square Kilometre Array, Giardini Naxos, Italy, 9/06/14. <http://pos.sissa.it/cgi-bin/reader/contribution.cgi?id=215/165>

TY - GEN

T1 - Model-independent constraints on dark energy and modified gravity with the SKA

AU - Zhao, Gong-Bo

AU - Bacon, David

AU - Maartens, Roy

AU - Santos, Mario

AU - Raccanelli, Alvise

N1 - 13 pages, 5 figures. The wrongly generated last page was removed. This article is part of the 'SKA Cosmology Chapter, Advancing Astrophysics with the SKA (AASKA14), Conference, Giardini Naxos (Italy), June 9th-13th 2014'

PY - 2015/1/15

Y1 - 2015/1/15

N2 - Employing a nonparametric approach of the principal component analysis (PCA), we forecast the future constraint on the equation of state w(z) of dark energy, and on the effective Newton constant µ(k, z), which parameterise the effect of modified gravity, using the planned SKA HI galaxy survey. Combining with the simulated data of Planck and Dark Energy Survey (DES), we find that SKA Phase 1 (SKA1) and SKA Phase 2 (SKA2) can well constrain 3 and 5 eigenmodes of w(z) respectively. The errors of the best measured modes can be reduced to 0.04 and 0.023 for SKA1 and SKA2 respectively, making it possible to probe dark energy dynamics. On the other hand, SKA1 and SKA2 can constrain 7 and 20 eigenmodes of µ(k, z) respectively within 10% sensitivity level. Furthermore, 2 and 7 modes can be constrained within sub percent level using SKA1 and SKA2 respectively. This is a significant improvement compared to the combineddatasets without SKA.

AB - Employing a nonparametric approach of the principal component analysis (PCA), we forecast the future constraint on the equation of state w(z) of dark energy, and on the effective Newton constant µ(k, z), which parameterise the effect of modified gravity, using the planned SKA HI galaxy survey. Combining with the simulated data of Planck and Dark Energy Survey (DES), we find that SKA Phase 1 (SKA1) and SKA Phase 2 (SKA2) can well constrain 3 and 5 eigenmodes of w(z) respectively. The errors of the best measured modes can be reduced to 0.04 and 0.023 for SKA1 and SKA2 respectively, making it possible to probe dark energy dynamics. On the other hand, SKA1 and SKA2 can constrain 7 and 20 eigenmodes of µ(k, z) respectively within 10% sensitivity level. Furthermore, 2 and 7 modes can be constrained within sub percent level using SKA1 and SKA2 respectively. This is a significant improvement compared to the combineddatasets without SKA.

KW - astro-ph.CO

KW - RCUK

KW - STFC

KW - ST/K0090X/1

UR - http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=215

M3 - Conference contribution

BT - Advancing Astrophysics with the Square Kilometre Array

PB - Proceedings of Science

T2 - Advancing Astrophysics with the Square Kilometre Array

Y2 - 9 June 2014 through 13 June 2014

ER -

Model-independent constraints on dark energy and modified gravity with the SKA

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