Galaxy evolution, cosmology and dark energy with the Square Kilometer Array

S. Rawlings, F. B. Abdalla, S. L. Bridle, C. A. Blake, C. M. Baugh, L. J. Greenhill, J. M. van der Hulst

    Research output: Contribution to journalArticlepeer-review


    The present-day Universe is seemingly dominated by dark energy and dark matter, but mapping the normal (baryonic) content remains vital for both astrophysics - understanding how galaxies form - and astro-particle physics - inferring properties of the dark components. The Square Kilometer Array (SKA) will provide the only means of studying the cosmic evolution of neutral hydrogen (HI) which, alongside information on star formation from the radio continuum, is needed to understand how stars formed from gas within dark-matter over-densities and the rôles of gas accretion and galaxy merging. 'All hemisphere' HI redshift surveys to z ∼ 1.5 are feasible with wide-field-of-view realizations of the SKA and, by measuring the galaxy power spectrum in exquisite detail, will allow the first precise studies of the equation-of-state of dark energy. The SKA will be capable of other uniquely powerful cosmological studies including the measurement of the dark-matter power spectrum using weak gravitational lensing, and the precise measurement of H0 using extragalactic water masers. The SKA is likely to become the premier dark-energy-measuring machine, bringing breakthroughs in cosmology beyond those likely to be made possible by combining CMB (e.g. Planck), optical (e.g. LSST, SNAP) and other early-21st-century datasets. © 2004 Publshed by Elsevier B.V.
    Original languageEnglish
    Pages (from-to)1013-1027
    Number of pages14
    JournalNew Astronomy Reviews
    Issue number11-12
    Publication statusPublished - Dec 2004


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