Zhao, Gong-BoBacon, DavidMaartens, RoySantos, Mario G.Raccanelli, Alvise2015-10-202015-10-202014Zhao, 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.1824-8039http://hdl.handle.net/10566/1822Advancing Astrophysics with the Square Kilometre Array June 8-13, 2014 Giardini Naxos, ItalyEmploying 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.enBased 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.pdfPrincipal Component Analysis (PCA)Newton constantModified gravityDark Energy Survey (DES)Square Kilometre Array (SKA)Cosmic Microwave Background (CMB)Large Scale Structure (LSS)Conference Paper