Journal Article

Revisiting the parametrization of equation of state of dark energy via SNIa data

Dao-Jun Liu, Xin-Zhou Li, Jiangang Hao and Xing-Hua Jin

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 1, pages 275-281
Published in print July 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13380.x
Revisiting the parametrization of equation of state of dark energy via SNIa data

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In this paper, we revisit the parametrizations of the equation of state of dark energy and point out that comparing merely the χ2 of different fittings may not be optimal for choosing the ‘best’ parametrization. Another figure of merit for evaluating different parametrizations based on the area of the w(z) −z band is proposed. In light of the analysis of some two-parameter parametrizations and models based on available SNIa data, the area of w(z) −z band seems to be a good figure of merit, especially in the situation that the value of χ2min for different parametrizations are very close. Therefore, we argue that both the area of the w(z) −z band and χ2min should be synthetically considered for choosing a better parametrization of dark energy in the future experiments.

Keywords: cosmological parameters

Journal Article.  4263 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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