The Effects of Inhomogeneities on Evaluating the Deceleration Parameter q$_0$

The Effects of Inhomogeneities on Evaluating the Deceleration Parameter q$_0$
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不均匀性对减速度参数 q$_0$ 评估的影响

DOI：
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发表时间：
1995
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影响因子：
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通讯作者：
David Branch
David Branch
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文献类型：
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作者：
R. Kantowski;T. Vaughan;David Branch

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本文用修正了Friedmann-Robertson-步行者（FRW）质量密度中某些不均匀性影响的距离-红移关系的解析表达式，说明了不均匀性对用Ia型超新星测定$q_0$的意义。从一组给定的观测值推断出的$q_0$的值取决于不均匀性中物质的分数，并且比使用纯尘埃FRW模型的标准Mattig $m$-$z$结果获得的值大50%。
Analytic expressions for distance-redshift relations which have been corrected for the effects of some inhomogeneities in the Friedmann-Robertson-Walker (FRW) mass density are used to illustrate the significance of inhomogeneities on a determination of $q_0$ made by using Type Ia supernovae. The value of $q_0$ inferred from a given set of observations depends on the fractional amount of matter in inhomogeneities and is up to 50 percent larger than that obtained by using the standard Mattig $m$-$z$ result for pure dust FRW models.