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arXiv 1108.2637astro-ph.CO
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WiggleZ暗能量巡天:使用Alcock-Paczynski试验和遥远超新星测量宇宙膨胀历史

The WiggleZ Dark Energy Survey: measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae

Chris Blake, Karl Glazebrook, Tamara Davis, Sarah Brough, Matthew Colless, Carlos Contreras, Warrick Couch, Scott Croom, Michael J. Drinkwater, Karl Forster, Da… 展开作者

Chris Blake, Karl Glazebrook, Tamara Davis, Sarah Brough, Matthew Colless, Carlos Contreras, Warrick Couch, Scott Croom, Michael J. Drinkwater, Karl Forster, David Gilbank, Mike Gladders, Ben Jelliffe, Russell J. Jurek, I-hui Li, Barry Madore, Chris Martin, Kevin Pimbblet, Gregory Poole, Michael Pracy, Rob Sharp, Emily Wisnioski, David Woods, Ted Wyder, Howard Yee

摘要:

天文观测表明,今天的宇宙是由未知物理来源的暗能量主导的。在许多模型中最值得注意的结果之一是,暗能量应该会导致宇宙加速膨胀:但膨胀率作为时间的函数已被证明非常难以直接测量。我们提出了一个新的宇宙膨胀的历史相结合的遥远的超新星观测与WiggleZ暗能量调查中的大规模星系集群的几何分析,使用Alcock Paczynski测试来测量标准球的失真。我们的结果构成了哈勃膨胀率作为时间函数的鲁棒和非参数测量,我们在红移范围0.1 < z < 0.9内的四个箱中以10-15%的精度测量。我们证明了宇宙膨胀正在加速,以一种独立于宇宙模型参数化的方式(尽管在我们的数据分析中假设宇宙是均匀的)。此外,我们发现这种膨胀历史与宇宙学常数暗能量是一致的。

英文摘要:

Astronomical observations suggest that today's Universe is dominated by a dark energy of unknown physical origin. One of the most notable consequences in many models is that dark energy should cause the expansion of the Universe to accelerate: but the expansion rate as a function of time has proven very difficult to measure directly. We present a new determination of the cosmic expansion history by combining distant supernovae observations with a geometrical analysis of large-scale galaxy clustering within the WiggleZ Dark Energy Survey, using the Alcock-Paczynski test to measure the distortion of standard spheres. Our result constitutes a robust and non-parametric measurement of the Hubble expansion rate as a function of time, which we measure with 10-15% precision in four bins within the redshift range 0.1 < z < 0.9. We demonstrate that the cosmic expansion is accelerating, in a manner independent of the parameterization of the cosmological model (although assuming cosmic homogeneity in our data analysis). Furthermore, we find that this expansion history is consistent with a cosmological-constant 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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