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arXiv 1503.02805astro-ph.CO
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不同空间和质量尺度上的暗能量意义图

A graph of dark energy significance on different spatial and mass scales

P. Teerikorpi, P. Heinämäki, P. Nurmi, A. D. Chernin, M. Einasto, M. Valtonen, G. Byrd

摘要:

当前的宇宙学范式认为宇宙大尺度结构的形成和演化受暗物质(DM)的引力吸引和暗能量(DE)的排斥的支配。我们的特点的相对重要性,均匀和恒定的暗能量,在标准LCDM宇宙学中的Lambda项,在不同尺度的星系系统,从集团到超星系团。介绍了一个具有指导意义的“λ显著性图”,其中绘制了不同星系系统的物质-DE密度比<rho_M>/rho_Lambda与半径R的关系。这给出了引力和DE主导的区域,并直接显示了零速度半径,零引力半径和任何固定质量值的爱因斯坦-斯特劳斯半径。局部宇宙的星系群和星系团的例子说明了Lambda显著性图的使用。它们通常位于引力主导区域&lt;rho_M}&gt;/rho_Lambda &gt; 2的深处,被维里化。超星系团的扩展星系团和主体可以到达重力主导区和DE主导区之间的边界线<rho_M>/rho_Lambda = 2。来自标准2点关联函数的尺度-质量关系在关联长度附近与该平衡线相交。log<rho_M>/rho_Lambda vs. log R图是描述以Lambda为主的膨胀宇宙中星系系统动力学状态的一种有用和通用的方法。

英文摘要:

The current cosmological paradigm sees the formation and evolution of the cosmic large-scale structure as governed by the gravitational attraction of the Dark Matter (DM) and the repulsion of the Dark Energy (DE). We characterize the relative importance of uniform and constant dark energy, as given by the Lambda term in the standard LCDM cosmology, in galaxy systems of different scales, from groups to superclusters. An instructive "Lambda significance graph" is introduced where the matter-DE density ratio <rho_M>/rho_Lambda for different galaxy systems is plotted against the radius R. This presents gravitation and DE dominated regions and shows directly the zero velocity radius, the zero-gravity radius, and the Einstein-Straus radius for any fixed value of mass. Example galaxy groups and clusters from the local universe illustrate the use of the Lambda significance graph. These are generally located deep in the gravity-dominated region <rho_M}>/rho_Lambda > 2, being virialized. Extended clusters and main bodies of superclusters can reach down near the border line between gravity-dominated and DE dominated regions <rho_M>/rho_Lambda = 2. The scale--mass relation from the standard 2-point correlation function intersects this balance line near the correlation lenght. The log <rho_M>/rho_Lambda vs. log R diagram is a useful and versatile way to characterize the dynamical state of systems of galaxies within the Lambda dominated expanding universe.

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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