Open AccessConstraining the nature of dark energy using the Square Kilometer Array Telescope
Author(s) -
TorresRodríguez A.,
Cress C. M.
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11565.x
Subject(s) - physics , dark energy , cosmic microwave background , astrophysics , redshift , galaxy , spectral density , quintessence , telescope , autocorrelation , astronomy , cosmology , anisotropy , optics , statistics , mathematics
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 Cosmic Microwave Background (CMB) temperature anisotropies are cross‐correlated with galaxies detectable with the SKA in H i . We consider using this measurement, the autocorrelation of H i 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 χ 2 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.