No evidence for dark energy metamorphosis? -: art. no. 007

被引：38

作者：

Jönsson, J ^{[1
]}

Goobar, A ^{[1
]}

Amanullah, R ^{[1
]}

Bergström, L ^{[1
]}

机构：

[1] Stockholm Univ, Dept Phys, Albanova Univ Ctr, S-10691 Stockholm, Sweden

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2004年 / 09期

关键词：

dark energy theory; supernova type Ia; cosmological constant experiments;

D O I：

10.1088/1475-7516/2004/09/007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent attempts to fit type Ia supernova data by modelling 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.-universe to show that the suggested 'evidence' for metamorphosis is also common for w(DE)=-1.

引用

页码：119 / 131

页数：13

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