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Perturbations and observables in inhomogeneous cosmologies

非均匀宇宙学中的扰动和可观测量

基本信息

批准号：
225630247
负责人：
Professor Dr. Matthias Bartelmann
金额：
--
依托单位：
Institut für Theoretische Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/225630247?language=en
关键词：
Perturbations observables inhomogeneous cosmologies

项目摘要

Is it possible that the apparently accelerated expansion of the Universe is not due to the repulsive effect of dark energy, but mimicked by the behaviour of a huge, underdense local environment? This question has often been addressed. A particularly suitable if idealised framework is provided by the class of Lemaître-Tolman-Bondi (LTB) solutions of General Relativity. Results achieved so far in this context seem to indicate that recent cosmological data rule out the hypothesis that we may be living in an inhomogeneous universe under certain restrictive assumptions, but are not in conflict with an LTB interpretation under more liberal conditions. We propose to extend existing studies in a five-fold way. We shall select those models from the LTB class that have a synchronous Big Bang. On this foundation, we shall then study systematically how the data allow our local cosmic environment to be structured, how linear structure formation proceeds in such models if couplings are allowed that have so far been neglected, how gravitational light deflection constrains LTB models, how temperature fluctuations in the cosmic microwave background must be interpreted and how non-linear structure formation proceeds. The results are expected to tighten the theoretical and empirical constraints on LTB models substantially.

有没有可能宇宙的明显加速膨胀不是由于暗能量的排斥效应，而是由一个巨大的、密度不足的局部环境的行为所模仿的？这个问题经常被讨论。如果理想化的话，一个特别合适的框架是由广义相对论的Lemaintre-Tolman-Bondi（LTB）解类提供的。在这种背景下，到目前为止所取得的结果似乎表明，最近的宇宙学数据排除了我们可能生活在一个非均匀的宇宙在某些限制性假设的假设，但并没有在更自由的条件下与LTB解释冲突。我们建议从五个方面扩展现有的研究。我们将从LTB类中选择具有同步大爆炸的模型。在此基础上，我们将系统地研究数据如何使我们的本地宇宙环境的结构，如何线性结构的形成在这样的模型中进行，如果耦合是允许的，到目前为止一直被忽视，引力光偏转如何约束LTB模型，如何在宇宙微波背景的温度波动必须解释和非线性结构的形成如何进行。研究结果有望大大加强对LTB模型的理论和经验约束。