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arXiv 1906.09588astro-ph.CO
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强透镜和引力波的宇宙距离对偶关系:一个无不透明度的检验

The cosmic distance duality relation with strong lensing and gravitational waves: an opacity-free test

Kai Liao

摘要:

宇宙距离对偶关系(CDDR)是宇宙学研究中的一个基本假设。给定红移$z$,它通过$(1+z)^2D^A/D^L\equiv1$将光度距离$D^L$与角直径距离$D^A$联系起来。许多努力致力于测试CDDR与各种观测方法。然而,据我们所知,这些方法总是受到宇宙不透明度的影响,这可能会使CDDR由于光子数不守恒而被破坏。这种机制与天体物理学有着更密切的联系。在这项工作中,直接研究时空的性质,即,为了从天体物理学中解脱出来,我们提出了一种新的方法来测试CDDR,用强透镜提供$D^A$,引力波提供$D^L$。众所周知,引力波的传播不受宇宙不透明度的影响。我们证明距离光学透镜观察也是不透明的。这两种距离测量使得检验光子沿零测地线传播的任何引力度规理论成为可能。我们的研究结果表明,对偏差的约束的CDDR将是非常有竞争力的,目前的技术。

英文摘要:

The cosmic distance duality relation (CDDR) is a fundamental assumption in cosmological studies. Given the redshift $z$, it relates luminosity distance $D^L$ with angular diameter distance $D^A$ through $(1+z)^2D^A/D^L\equiv1$. Many efforts have been devoted to test the CDDR with various observational approaches. However, to the best of our knowledge, those methods are always affected by cosmic opacity which could make the CDDR violated due to the non-conservation of photon number. Such mechanism is more related with astropartical physics. In this work, to directly study the nature of space-time, i.e., to disentangle it from astropartical physics, we propose a new strategy to test the CDDR with strong lensing providing $D^A$ and gravitational wave providing $D^L$. It is known that the propagation of gravitational wave is unaffected by cosmic opacity. We demonstrate distances from optical lensing observation are also opacity-free. These two kinds of distance measurements make it possible to test any metric theories of gravity where photons travel along null geodesics. Our results show the constraints on deviations of the CDDR will be very competitive to current techniques.

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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