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arXiv 0902.3226astro-ph.CO
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星系团巡天中暗能量扰动的特征

The signature of dark energy perturbations in galaxy cluster surveys

L. Raul Abramo, Ronaldo C. Batista, Rogerio Rosenfeld

摘要:

所有的动态暗能量模型都具有波动,这会影响宇宙中星系团的数量。我们已经研究了暗能量集群上的集群数量的影响,使用推广的球形坍缩模型和Press-Schechter形式主义。我们的统计分析是在一个7参数空间中使用Fisher矩阵方法,几个假设的Sunyaev-Zel'dovich和弱透镜(剪切图)调查。在某些情况下,这些波动的影响足够大,当南极望远镜的数据与WMAP和SDSS相结合时,它们的影响已经可以被现有的仪器检测到。未来的观测可以走得更远,通过区分不同模型的扰动,而不仅仅是它们的膨胀历史,来探测暗能量的本质。

英文摘要:

All models of dynamical dark energy possess fluctuations, which affect the number of galaxy clusters in the Universe. We have studied the impact of dark energy clustering on the number of clusters using a generalization of the spherical collapse model and the Press-Schechter formalism. Our statistical analysis is performed in a 7-parameter space using the Fisher matrix method, for several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) surveys. In some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when its data is combined with WMAP and SDSS. Future observations could go much further and probe the nature of dark energy by distinguishing between different models on the basis of their perturbations, not only their expansion histories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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