Linear kinetic Sunyaev–Zel'dovich effect and void models for acceleration
Linear kinetic Sunyaev–Zel'dovich effect and void models for acceleration
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DOI：
10.1088/0264-9381/28/16/164005
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发表时间：
2011-05
影响因子：
3.5
通讯作者：
J. Zibin;Adam Moss
中科院分区：
文献类型：
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作者：
J. Zibin;Adam Moss
最近人们对宇宙学模型产生了相当大的兴趣，在这些模型中，当前的表观加速是由于非常大的局部低密度或空隙，而不是某种形式的暗能量。在这里，我们研究了一项新的提议，利用由于空隙内的结构而产生的线性动力学 Sunyaev-Zel'dovich (kSZ) 效应来约束此类模型。先前研究的简化“哈勃气泡”模型似乎预测的 kSZ 功率远高于实际观测到的功率，与此类模型中初始条件和扰动演化的细节无关。我们表明，在完全相对论的问题处理下，kSZ 效应的约束力被大大削弱（尽管仍然令人印象深刻），并指出了一些理论模糊性和观测缺陷，进一步验证了结果。尽管如此，我们得出的结论是，kSZ 和其他方法的结合排除了很大一类空洞模型。
There has been considerable recent interest in cosmological models in which the current apparent acceleration is due to a very large local underdensity, or void, instead of some form of dark energy. Here we examine a new proposal to constrain such models using the linear kinetic Sunyaev–Zel'dovich (kSZ) effect due to the structure within the void. The simplified ‘Hubble bubble’ models previously studied appeared to predict far more kSZ power than is actually observed, independently of the details of the initial conditions and evolution of perturbations in such models. We show that the constraining power of the kSZ effect is considerably weakened (though still impressive) under a fully relativistic treatment of the problem and point out several theoretical ambiguities and observational shortcomings which further qualify the results. Nevertheless, we conclude that a very large class of void models is ruled out by the combination of kSZ and other methods.