arXiv 0807.35772008-07astro-phgr-qc

宇宙的表观加速度和平均加速度

Apparent and average acceleration of the Universe

Krzysztof Bolejko, Lars Andersson

备注：: 15 pages, 5 figures; matches published version
发表信息：: JCAP 0810:003,2008
DOI：: 10.1088/1475-7516/2008/10/003

摘要：

在本文中，我们考虑在Buchert平均方案中得到的体积减速参数和从超新星观测中得到的减速参数之间的关系。这项工作的动机是最近的研究结果表明，有模型，尽管$Λ=0$体积减速参数$q^{vol} < 0$。这开启了一种可能性，即逆反应和平均效应可能被用作暗能量现象的一种有趣的替代解释。我们计算了Lemaintre-Tolman模型中的$q^{vol}$。对于那些被选择为现实的，适合超新星数据的模型，我们发现$q^{vol} > 0$，而那些模型，我们已经能够找到其中显示$q^{vol} < 0$原来是不现实的。这表明在将减速参数与观测值联系起来时必须小心。

英文摘要：

In this paper we consider the relation between the volume deceleration parameter obtained within the Buchert averaging scheme and the deceleration parameter derived from the supernova observation. This work was motivated by recent findings that showed that there are models which despite $Λ=0$ have volume deceleration parameter $q^{vol} < 0$. This opens the possibility that backreaction and averaging effects may be used as an interesting alternative explanation to the dark energy phenomenon. We have calculated $q^{vol}$ in some Lemaître--Tolman models. For those models which are chosen to be realistic and which fit the supernova data, we find that $q^{vol} > 0$, while those models which we have been able to find which exhibit $q^{vol} < 0$ turn out to be unrealistic. This indicates that care must be exercised in relating the deceleration parameter to observations.

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