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arXiv 1105.0946astro-ph.CO
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强引力透镜系统的宇宙状态方程

Cosmic Equation of state from Strong Gravitational Lensing Systems

M. Biesiada, A. Piorkowska, B. Malec

摘要:

宇宙的加速膨胀对物理学和宇宙学都是一个巨大的挑战。在缺乏令人信服的理论解释的情况下,用宇宙物态方程对这一现象进行有效的描述是有用的。现代宇宙学的力量在于独立的、往往不相关的证据之间的一致性。因此,任何一种限制宇宙物态方程的方法都是重要的。强引力透镜类星体星系系统通过结合恒星运动学(中心速度色散测量)和透镜几何学(从图像位置确定爱因斯坦半径)创造了这样的新机会。本文将这种方法应用于SLACS和LSD引力透镜观测的组合数据集。结果得到了宇宙状态方程参数,与文献中已知的结果基本一致。这表明该方法可以进一步用于将来获得的更大样品。独立注意到标准蜡烛和标准尺上完成的拟合之间的系统偏差在我们的研究结果中被揭示。我们还确定了一个重要的选择效果至关重要的我们的方法与几何配置的透镜系统沿视线,这可能会有后果的样品建设从未来的透镜调查。

英文摘要:

Accelerating expansion of the Universe is a great challenge for both physics and cosmology. In light of lacking the convincing theoretical explanation, an effective description of this phenomenon in terms of cosmic equation of state turns out useful. The strength of modern cosmology lies in consistency across independent, often unrelated pieces of evidence. Therefore, every alternative method of restricting cosmic equation of state is important. Strongly gravitationally lensed quasar-galaxy systems create such new opportunity by combining stellar kinematics (central velocity dispersion measurements) with lensing geometry (Einstein radius determination form position of images). In this paper we apply such method to a combined data sets from SLACS and LSD surveys of gravitational lenses. In result we obtain the cosmic equation of state parameters, which generally agree with results already known in the literature. This demonstrates that the method can be further used on larger samples obtained in the future. Independently noticed systematic deviation between fits done on standard candles and standard rulers is revealed in our findings. We also identify an important selection effect crucial to our method associated with geometric configuration of the lensing system along line of sight, which may have consequences for sample construction from the future lensing surveys.

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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