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arXiv 1106.4294astro-ph.CO
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哈勃参数数据对暗能量的限制

Hubble parameter data constraints on dark energy

Yun Chen, Bharat Ratra

摘要:

我们使用Stern等人(2010)和Gaztañaga等人(2009)的哈勃参数与红移数据对恒定和时间演化的暗能量宇宙学模型的模型参数进行约束。这些限制与来自Ia型超新星星等红移数据的限制是一致的。然而,它们比由星系团角直径距离导出的结果更严格,并且与由伽马射线暴和回望时间数据导出的结果具有可比性。联合分析的哈勃参数数据与更严格的重子声学振荡峰值长度尺度和超新星Ia型视星等数据有利于一个空间平坦的宇宙学模型,目前占主导地位的时间无关的宇宙学常数,但不排除随时间变化的暗能量。

英文摘要:

We use Hubble parameter versus redshift data from Stern, et al(2010) and Gaztañaga, et al (2009) to place constraints on model parameters of constant and time-evolving dark energy cosmological models. These constraints are consistent with (through not as restrictive as) those derived from supernova Type Ia magnitude-redshift data. However, they are more restrictive than those derived from galaxy cluster angular diameter distance, and comparable with those from gamma-ray burst and lookback time data. A joint analysis of the Hubble parameter data with more restrictive baryon acoustic oscillation peak length scale and supernova Type Ia apparent magnitude data favors a spatially-flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude time-varying dark energy.

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