关于超光速统一暗物质模型中观测信号的注记
A note on observational signatures in superluminal unified dark matter models
摘要：
我们探讨了暗物质和暗能量被单一流体或单一$k$ -类本质标量场模拟的可能性。所谓的Chaobergin气体统一暗物质模型通过加入重子分量可以再现观测到的物质功率谱。有人认为，重子涨落的演化特别适合于“超光速”的情况，即查伯金气体的声速在后期超过光速，以及声速小到可以忽略的模型。在本文中，我们计算积分Sachs-Wolfe信号的Chaubergin气体模型，专注于超光速的情况下，还没有被调查之前，因为过早的理解因果关系。结果表明，超光速模型导致了积分萨克斯-沃尔夫效应的大幅度增强，这与CMB测量结果不一致。
英文摘要：
We explore the possibility that the dark matter and dark energy are mimicked by a single fluid or by a single $k$-essence-like scalar field. The so called Chaplygin gas unified dark matter models can reproduce the observed matter power spectrum by adding a baryon component. It has been argued that the evolution of the baryon fluctuations is particularly favoured for the "superluminal" case where the sound speed of the Chaplygin gas exceeds the speed of light at late times, as well as for the models with the negligibly small sound speed. In this note we compute the integrated Sachs-Wolfe signal in the Chaplygin gas models, focusing on the superluminal case which has not been investigated before because of the premature understanding of causality. It is shown that the superluminal model leads to large enhancement of the integrated Sachs-Wolfe effect, which is inconsistent with the CMB measurements.
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