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arXiv 1904.11751astro-ph.COgr-qc
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强透镜引力波暗能量状态方程的互补约束

Complementary constraints on dark energy equation of state from strongly lensed gravitational wave

Bin Liu, Zhengxiang Li, Zong-Hong Zhu

摘要:

研究表明,强引力透镜的时间延迟不仅是约束哈勃常数、物质密度和宇宙曲率的一种有效的宇宙学探索,而且对于打破暗能量状态方程的简并性也是有用的,从而与其他流行的探索,如Ia型超新星、重子声学振荡和宇宙微波背景辐射等提供了互补。有趣的是,与传统的强透镜系统相比,类星体作为源,强透镜的引力波(GWs)从紧凑的双合并和他们的电磁(EM)的同行者系统最近已被提出更强大的研究宇宙学,因为GWs和他们的EM同行者是瞬态的。短持续时间的GW及其EM对应物对于时间延迟测量和透镜轮廓建模是非常有利的。在CPL参数化的框架下,我们研究了强透镜GW系统的时延测量对暗能量状态方程约束功率的改善.建议在第三代地基探测器如爱因斯坦望远镜的基础上,仅对Ia型超新星和宇宙微波背景辐射增加30个强透镜GW系统的时间延迟,就可以将暗能量优值提高2倍。对于传统的标准海妖方法,其中的全球Ws的光度距离的不确定度是$\sim10\%$,一些$\times~10^4$事件预计将提出类似的约束。在精密宇宙学时代,这一进展对于研究暗能量的本质具有重要意义。

英文摘要:

It has been shown that time delay of strong gravitational lensing is not only an effective cosmological probe to constrain the Hubble constant, the matter density and the curvature of the universe but also useful for breaking the degeneracy of the dark energy equation of state and thus provide complementarity with other popular probes, such as type Ia supernovae, baryon acoustic oscillations, and cosmic microwave background radiation. Interestingly, compared to traditional strong lensing systems where quasars act as sources, strongly lensed gravitational waves (GWs) from compact binary coalescence and their electromagnetic (EM) counterparts systems have been recently proposed to be more powerful for studying cosmology since GWs and their EM counterparts are transients. Short durations of GWs and their EM counterparts are very advantageous to time delay measurement and lens profile modeling. Here, in the framework of Chevalier-Polarski-Linder (CPL) parametrization, we investigate improvement of constraining power on dark energy equation of state due to including time delay measurements of strong lensed GW systems. It is suggested that, on the basis of the third generation ground-based detector, e.g. Einstein Telescope, adding time delay of only 30 strong lensed GW systems to type Ia supernovae and cosmic microwave background radiation can improve the dark energy figure of merit by a factor 2. For the traditional standard siren method where the uncertainties of luminosity distances of GWs are $\sim10\%$, a few $\times~10^4$ events are expected to present similar constraints. In the precision cosmology era, this progress is of great significance for studying the nature of 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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