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arXiv 0709.3672astro-ph
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用重子声学振荡强度作图检验暗能量

Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy

Tzu-Ching Chang, Ue-Li Pen, Jeffrey B. Peterson, Patrick McDonald

摘要:

宇宙的膨胀似乎正在加速,而这种加速的神秘反重力因素被称为"暗能量“。为了测量暗能量的动力学,可以使用重子声学振荡(BAO)。之前对BAO暗能量测试的讨论主要集中在通过观测21厘米谱线或探测光发射来直接测量$10^9$单个星系的红移。在这里,我们展示了如何在21厘米亮度的声学振荡的研究可以完成经济的三维强度映射。如果我们的估计获得接受,它们可能是一类新的暗能量实验的起点,致力于无线电天空的大角度尺度映射,揭示暗能量。

英文摘要:

The expansion of the universe appears to be accelerating, and the mysterious anti-gravity agent of this acceleration has been called ``dark energy''. To measure the dynamics of dark energy, Baryon Acoustic Oscillations (BAO) can be used. Previous discussions of the BAO dark energy test have focused on direct measurements of redshifts of as many as $10^9$ individual galaxies, by observing the 21cm line or by detecting optical emission. Here we show how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three dimensional intensity mapping. If our estimates gain acceptance they may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.

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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