Analyses of Type Ia Supernova Data in Cosmological Models with a Local Void
Analyses of Type Ia Supernova Data in Cosmological Models with a Local Void
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DOI：
10.1143/ptp.106.929
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发表时间：
2001-04
影响因子：
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通讯作者：
K. Tomita
中科院分区：
文献类型：
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作者：
K. Tomita
对High-z SN搜索团队和超新星宇宙学项目获得的Ia型超新星数据进行了分析，得到了模型参数和置信度等值线的最佳拟合值。Χ-2模型的拟合效果略好于均匀模型。结果表明：(1)最佳拟合值对外哈勃常数HI0与内哈勃常数HI0的比值R最为敏感；(2)最佳拟合外密度参数ΩI0和宇宙常数参数λI0分别是R的递增和递减函数；(3)(ΩI0，ALL)对于R0.8可以是(1，0).此外，这些模型与新的超新星数据(SN1997ff)在z=1.7时是自然一致的。
The data for type Ia supernovae obtained by the High-z SN Search Team and Supernova Cosmology Project are analyzed using inhomogeneous cosmological models with a local void on scales of about 200 Mpc, to derive the best-fit values of model parameters and the confidence contours. The Χ 2 fitting is found to be slightly better than that in homogeneous models. It is shown that (1) the best-fit values are most sensitive to the ratio R of the outer Hubble constant, H I I 0 , to the inner Hubble constant, H I 0 , (2) the best-fit outer density parameter, Ω I I 0 , and cosmological constant parameter, λ I I 0 , are, respectively, increasing and decreasing functions of R, and (3) (Ω I I 0 , All) can be (1, 0) for R 0.8. Moreover, it is shown that these models are naturally consistent with the new supernova data (SN1997ff) with z = 1.7.