No evidence for Dark Energy Metamorphosis ?

Details No evidence for Dark Energy Metamorphosis ? No evidence for Dark Energy Metamorphosis ?

2004-04-23

arxiv.org/abs/astro-ph/0404468v2

JCAP0409:007,2004

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures, Minor revisions to match version accepted in Journal of Cosmology and Astroparticle Physics

Scientific paper

10.1088/1475-7516/2004/09/007

Recent attempts to fit Type Ia supernova data by modeling the dark energy density as a truncated Taylor series have suggested the possibility of metamorphosis, i.e., a rapidly evolving equation of state parameter, w_DE(z). However, we show that fits using that parametrization have significant problems: evolution of w_DE(z) is both favoured and in some sense forced, and the equation of state parameter blows up or diverges in large regions of the parameter space. To further elucidate these problems we have simulated sets of supernova data in a Lambda-universe to show that the suggested ``evidence'' for metamorphosis is also common for w_DE=-1.

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