Investigating the Effect of Cosmic Opacity on Standard Candles
Investigating the Effect of Cosmic Opacity on Standard Candles
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DOI：
10.3847/1538-4357/aa5b89
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Ju Hu;Hai-Bo Yu;Fayin Wang
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文献类型：
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作者：
Ju Hu;Hai-Bo Yu;Fayin Wang
标准烛光可以探测暗能量在大红移范围内的演化。但是宇宙的不透明性会降低标准蜡烛的质量。在本文中，我们使用最新的观测，包括Ia型超新星（SNe Ia）的“联合光变曲线分析”样本和哈勃参数，探测宇宙的不透明度。一个联合拟合的超新星Ia的光变曲线参数，宇宙学参数，和不透明度是为了避免超新星Ia光度距离的宇宙学依赖。最新的伽玛射线暴被用来探索高红移下的宇宙不透明度。宇宙再电离过程被认为是在高红移。我们发现，对于平坦的ΛCDM和XCDM模型，该样品支持一个几乎透明的宇宙.与此同时，自由电子通过（逆）康普顿散射耗尽标准烛光中的光子，这被认为是不透明度的重要组成部分。这种康普顿变暗可能在未来的超新星调查中发挥重要作用。通过分析，我们发现两个模型中大约百分之几的宇宙不透明度是由康普顿变暗引起的，这是可以校正的。
Standard candles can probe the evolution of dark energy over a large redshift range. But the cosmic opacity can degrade the quality of standard candles. In this paper, we use the latest observations, including Type Ia supernovae (SNe Ia) from the “joint light-curve analysis” sample and Hubble parameters, to probe the opacity of the universe. A joint fitting of the SNe Ia light-curve parameters, cosmological parameters, and opacity is used in order to avoid the cosmological dependence of SNe Ia luminosity distances. The latest gamma-ray bursts are used in order to explore the cosmic opacity at high redshifts. The cosmic reionization process is considered at high redshifts. We find that the sample supports an almost transparent universe for flat ΛCDM and XCDM models. Meanwhile, free electrons deplete photons from standard candles through (inverse) Compton scattering, which is known as an important component of opacity. This Compton dimming may play an important role in future supernova surveys. From analysis, we find that about a few per cent of the cosmic opacity is caused by Compton dimming in the two models, which can be corrected.