Redshift drift in Lemaître-Tolman-Bondi void universes
Redshift drift in Lemaître-Tolman-Bondi void universes
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DOI：
10.1103/physrevd.83.043527
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发表时间：
2011-02
影响因子：
5
通讯作者：
Chul-Moon Yoo;T. Kai;K. Nakao
中科院分区：
文献类型：
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作者：
Chul-Moon Yoo;T. Kai;K. Nakao
我们研究红移漂移，即假定观察者位于对称中心的勒梅特-托尔曼-邦迪 (LTB) 解中宇宙学红移的时间导数。该解决方案经常被作为反哥白尼宇宙模型来研究，以在不引入暗能量概念的情况下解释宇宙体积膨胀的加速。 LTB宇宙模型和哥白尼暗能量宇宙模型之间的决定性区别之一被认为是红移漂移。在所有已知的 LTB 宇宙模型中，红移漂移都是负的，而在红移域 z < 或大约 1 中，红移漂移是正的。 2 在哥白尼暗能量模型中。然而，目前还没有关于这个问题的详细研究。在本文中，我们证明在 LTB 空洞模型的情况下，偏心光源的红移漂移始终为负。我们还表明，红移漂移可以是正值，并且具有极大的驼峰型不均匀性。我们的结果表明，我们可以通过观察红移漂移来确定我们是否生活在没有暗能量的大空洞中心附近。
We study the redshift drift, i.e., the time derivative of the cosmological redshift in the Lemaitre-Tolman-Bondi (LTB) solution in which the observer is assumed to be located at the symmetry center. This solution has often been studied as an anti-Copernican universe model to explain the acceleration of cosmic volume expansion without introducing the concept of dark energy. One of the decisive differences between LTB universe models and Copernican universe models with dark energy is believed to be the redshift drift. The redshift drift is negative in all known LTB universe models, whereas it is positive in the redshift domain z < or approx. 2 in Copernican models with dark energy. However, there have been no detailed studies on this subject. In the present paper, we prove that the redshift drift of an off-center source is always negative in the case of LTB void models. We also show that the redshift drift can be positive with an extremely large hump-type inhomogeneity. Our results suggest that we can determine whether we live near the center of a large void without dark energy by observing the redshift drift.