Journal Article

Cosmography and cosmic acceleration

J. C. Carvalho and J. S. Alcaniz

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 3, pages 1873-1877
Published in print December 2011 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19603.x
Cosmography and cosmic acceleration

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We investigate the prospects for determining the accelerating history of the Universe from upcoming measurements of the expansion rate H(z). In our analyses, we use Monte Carlo simulations based on w cold dark matter models to generate samples with different characteristics and calculate the evolution of the deceleration parameter q(z). We show that a cosmographic (and, therefore, model-independent) evidence for cosmic acceleration [q(z < zt) < 0, where zt is the transition redshift] will be possible only with an accuracy in H(z) data expected in some planned surveys. A brief discussion about the prospects for reconstructing the dark energy equation of state from the parameters H(z) and q(z) is also included.

Keywords: cosmological parameters; dark energy; distance scale

Journal Article.  2760 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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