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arXiv 0906.4857astro-ph.COgr-qc
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各向异性在无暗能量空洞模型中的作用

The Role of Anisotropy in the Void Models without Dark Energy

Masayuki Tanimoto, Yasusada Nambu, Kazuhiro Iwata

摘要:

虚空模型为没有暗能量的宇宙“加速膨胀”提供了一种可能的解释。为了使传统的空洞模型更现实,我们允许的空隙,我们周围的一个undersense区域,是各向异性的,并考虑在观察员对着的立体角的距离红移关系的平均值。我们首先表明,在采取平均的光学标量方程(距离方程)的形式,我们得到的有效距离方程与Lemaitre-Tolman-Bondi宇宙的Dyer-Roeder-like扩展。然后,我们数值求解方程比较与Ia型超新星的观测数据。我们发现各向异性允许更小的空洞尺寸和更大的Ω_m。

英文摘要:

Void models provide a possible explanation of the "accelerated expansion" of the Universe without dark energy. To make the conventional void models more realistic, we allow the void, an underdense region around us, to be anisotropic and consider an average of the distance-redshift relations over the solid angle subtended at the observer. We first show that after taking the average of a form of the optical scalar equation (distance equation), the effective distance equation we obtain coincides with the one for the Lemaitre-Tolman-Bondi universe with a Dyer-Roeder-like extension. We then numerically solve the equation to compare with observational data of Type Ia supernovae. We find that anisotropy allows smaller size of void and larger Omega_m.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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