关于非平凡拓扑的可检测性
On the detectability of non-trivial topologies
摘要：
我们探讨的主要物理过程，可能会影响拓扑信号的宇宙微波背景（CMB）的一系列环形宇宙。我们特别考虑再电离，综合萨克斯-沃尔夫（ISW）效应，因果视界的大小，拓扑缺陷和原始引力波。我们使用三个估计：信息含量，S/N统计量和贝叶斯证据。虽然再电离几乎没有影响的估计，我们表明，考虑到ISW强烈降低我们的能力，检测到的拓扑信号。我们还研究了在目前数据允许的2 σ范围内改变相关宇宙学参数的影响。我们发现，只有Omega_Lambda，这影响了ISW和因果范围的大小，显着改变检测所有三个估计在这里考虑。
英文摘要：
We explore the main physical processes which potentially affect the topological signal in the Cosmic Microwave Background (CMB) for a range of toroidal universes. We consider specifically reionisation, the integrated Sachs-Wolfe (ISW) effect, the size of the causal horizon, topological defects and primordial gravitational waves. We use three estimators: the information content, the S/N statistic and the Bayesian evidence. While reionisation has nearly no effect on the estimators, we show that taking into account the ISW strongly decreases our ability to detect the topological signal. We also study the impact of varying the relevant cosmological parameters within the 2 sigma ranges allowed by present data. We find that only Omega_Lambda, which influences both ISW and the size of the causal horizon, significantly alters the detection for all three estimators considered here.
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