Constraining the Nature of Dark Energy using the SKA

Details Constraining the Nature of Dark Energy using the SKA Constraining the Nature of Dark Energy using the SKA

2007-02-05

arxiv.org/abs/astro-ph/0702113v2

Mon.Not.Roy.Astron.Soc.376:1831-1837,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures; updated references for publication MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11565.x

We investigate the potential of the Square Kilometer Array Telescope (SKA) to constrain the sound speed of dark energy. The Integrated Sachs Wolfe (ISW) effect results in a significant power spectrum signal when CMB temperature anisotropies are cross-correlated with galaxies detectable with the SKA in HI. We consider using this measurement, the autocorrelation of HI galaxies and the CMB temperature power spectrum to derive constraints on the sound speed. We study the contributions to the cross-correlation signal made by galaxies at different redshifts and use redshift tomography to improve the signal-to-noise. We use a chi-square analysis to estimate the significance of detecting a sound speed different from that expected in quintessence models, finding that there is potential to distinguish very low sound speeds from the quintessence value.

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