Cosmic distance duality and cosmic transparency
Cosmic distance duality and cosmic transparency
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DOI：
10.1088/1475-7516/2012/12/028
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发表时间：
2012-10
影响因子：
6.4
通讯作者：
Remya Nair;S. Jhingan;D. Jain
中科院分区：
文献类型：
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作者：
Remya Nair;S. Jhingan;D. Jain
我们比较距离测量从两个距离指标，超新星观测（标准蜡烛）和重子声学振荡数据（标准标尺）。从SDSS，6dFGS和最新的BOSS和WiggleZ调查的BAO数据的超新星的Union 2样本被用来寻找偏离距离对偶关系。我们发现超新星比BAO测量的预期要亮。光度距离倾向于比从角直径距离估计中预期的要小，这在早期的距离对偶性研究中也发现了，但这种趋势在统计上并不显著。这进一步限制了宇宙的透明度。
We compare distance measurements obtained from two distance indicators, Supernovae observations (standard candles) and Baryon acoustic oscillation data (standard rulers). The Union2 sample of supernovae with BAO data from SDSS, 6dFGS and the latest BOSS and WiggleZ surveys is used in search for deviations from the distance duality relation. We find that the supernovae are brighter than expected from BAO measurements. The luminosity distances tend to be smaller then expected from angular diameter distance estimates as also found in earlier works on distance duality, but the trend is not statistically significant. This further constrains the cosmic transparency.