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arXiv 2111.02007gr-qcastro-ph.COastro-ph.HE
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利用引力透镜探测极低频引力波

Detection of extremely low frequency gravitational wave using gravitational lens

Wenshuai Liu

摘要:

研究了宇宙学波长的引力波对引力透镜的影响。当光源、偏转器和观察者在高度对称的配置中对齐时,观察者将观察到爱因斯坦环。在没有引力波的情况下,爱因斯坦环上的不同位置之间将没有时间延迟。否则,当宇宙引力波在爱因斯坦环中传播时,环上不同位置之间会出现时间延迟。已有的研究表明,在有宇宙学波长的引力波存在时,源-偏转器-观测者配置的对准所产生的时间延迟可以等效于在没有引力波存在时,源-偏转器-观测者配置的非对准透镜所产生的时间延迟。结果表明,当考虑观测者观测到的整个爱因斯坦环时,具有源-偏转器-观测者对准结构的引力透镜可以作为潜在的引力波探测器.

英文摘要:

The effect of gravitational wave of cosmological wavelength on the gravitational lensing is investigated. When the source, deflector, and observer are aligned in a highly symmetric configuration, an Einstein ring will be observed by the observer. There will be no time delays between different locations on the Einstein ring in the absence of gravitational wave. Otherwise, time delays between different locations on the Einstein ring will emerge if cosmological gravitational wave propagates through the system. Previous studies demonstrated that the time delay resulting from the aligned source-deflector-observer configuration in the presence of gravitational wave of cosmological wavelength could be equivalent to that of a similar lens with a nonaligned source-deflector-observer configuration in the absence of gravitational wave. Results in this work show that gravitational lens with the aligned source-deflector-observer configuration could serve as a potential gravitational wave detector when the whole Einstein ring observed by the observer is taken into account.

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