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arXiv 0912.3157astro-ph.COgr-qc
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束缚结构能阻止宇宙加速吗?

Do Bound Structures Brake Cosmic Acceleration?

Lily Schrempp, Iain A. Brown

摘要:

本文研究了经典场与团簇物质之间的耦合对标量场平均物态方程的影响。我们采取的NFW配置文件是银河系和集群规模的绑定结构的特点,和等温分布举行的超集群规模的对象。解析求解标量场的轮廓,我们发现,最大的影响状态方程来自超星系团。采用数值算例研究,我们验证了这种效果,并探讨其依赖于超星系团的演化状态。通过哈勃体积的估计,对均匀状态方程的修正约为3%,并随着耦合强度的增加而增加。

英文摘要:

In this paper we investigate the impact of the coupling between a quintessence field and clustered matter on the average equation of state of the scalar field. We take the NFW profile to be characteristic of bound structures on galactic and cluster scales, and the isothermal distribution to hold for objects on supercluster scales. Solving analytically for the scalar-field profile, we find that the greatest impact on the equation of state comes from the superclusters. Employing numerical case studies, we verify this effect and probe its dependence on the evolutionary state of the supercluster. An estimate across the Hubble volume yields corrections to the homogeneous equation of state of ~3%, increasing with coupling strength.

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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