Analyses of Type Ia Supernova Data in Cosmological Models with a Local Void

概要

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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^<II>_0, to the inner Hubble constant, H^<I>_0, (2)the best-fit outer density parameter, Ω^<II>_0, and cosmological constant parameter, λ^<II>_0, are, respectively, increasing and decreasing functions of R, and (3)(Ω^<II>_0, λ^<II>_0)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.
理論物理学刊行会の論文
2001-11-25