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arXiv 1806.04027gr-qc
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引力波的极化

The Polarizations of Gravitational Waves

Yungui Gong, Shaoqi Hou

摘要:

LIGO/Virgo对引力波的直接探测为在高速、强场条件下检验广义相对论及其替代理论提供了可能。相对于广义相对论,其他引力理论一般都预言了更多的极化,因此研究引力理论中的极化内容对于揭示引力的本质具有重要意义。在这次演讲中,我们分析了Horndeski理论和$f(R)$引力的偏振内容。我们发现,除了熟悉的正极化和交叉极化,\emph{massless} Horndeski理论预测了额外的横向极化,并且在\emph{massive} Horndeski理论和$f(R)$引力中存在纯纵向和横向呼吸极化的混合。在这些理论中,利用脉冲星定时阵列探测额外极化是可能的。我们还指出,用Newman-Penrose变量对极化进行分类的方法不能适用于大质量模。它也不能用来对Einstein-EtherTM理论或广义TeVeS理论中的极化进行分类。

英文摘要:

The direct detection of gravitational waves by LIGO/Virgo opened the possibility to test General Relativity and its alternatives in the high speed, strong field regime. Alternative theories of gravity generally predict more polarizations than General Relativity, so it is important to study the polarization contents of theories of gravity to reveal the nature of gravity. In this talk, we analyzed the polarizations contents of Horndeski theory and $f(R)$ gravity. We found out that in addition to the familiar plus and cross polarizations, a \emph{massless} Horndeski theory predicts an extra transverse polarization, and there is a mix of the pure longitudinal and transverse breathing polarizations in the \emph{massive} Horndeski theory and $f(R)$ gravity. It is possible to use pulsar timing arrays to detect the extra polarizations in these theories. We also pointed out that the classification of polarizations using Newman-Penrose variables cannot be applied to the massive modes. It cannot be used to classify polarizations in Einstein-æther theory or generalized TeVeS theory, either.

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