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

dc.contributor.authorZhao, Gong-Bo
dc.contributor.authorBacon, David
dc.contributor.authorMaartens, Roy
dc.contributor.authorSantos, Mario G.
dc.contributor.authorRaccanelli, Alvise
dc.date.accessioned2015-10-20T20:49:03Z
dc.date.available2015-10-20T20:49:03Z
dc.date.issued2014
dc.descriptionAdvancing Astrophysics with the Square Kilometre Array June 8-13, 2014 Giardini Naxos, Italyen_US
dc.description.abstractEmploying 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 m(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 m(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.en_US
dc.identifier.citationZhao, Gong-Bo, et al., (2014). Model-independent constraints on dark energy and modified gravity with the SKA. Paper presented at Advancing Astrophysics with the Square Kilometre Array, Giardini Naxos, Italy.en_US
dc.identifier.issn1824-8039
dc.identifier.urihttp://hdl.handle.net/10566/1822
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherProceedings of Scienceen_US
dc.rightsBased on the open access philosophy proceedings published on PoS can be read free of charge. No subscription nor registration is required of readers. This article can be accessed at http://pos.sissa.it/archive/conferences/215/165/AASKA14_165.pdf
dc.status.ispeerreviewedtrue
dc.subjectPrincipal Component Analysis (PCA)en_US
dc.subjectNewton constanten_US
dc.subjectModified gravityen_US
dc.subjectDark Energy Survey (DES)en_US
dc.subjectSquare Kilometre Array (SKA)en_US
dc.subjectCosmic Microwave Background (CMB)en_US
dc.subjectLarge Scale Structure (LSS)en_US
dc.titleModel-independent constraints on dark energy and modified gravity with the SKAen_US
dc.typeConference Paperen_US

Files

Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
maartens_AASKA14_165.pdf
Size:
533.82 KB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.55 KB
Format:
Item-specific license agreed upon to submission
Description: