arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.00754astro-ph.HEgr-qc
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用多波长偏振天体物理源约束爱因斯坦等效原理

Constraining Einstein's Equivalence Principle With Multi-Wavelength Polarized astrophysical Sources

Shuang-Xi Yi, Yuan-Chuan Zou, Jun-Jie Wei, Qi-Qi Zhou

摘要:

观测到的天体不同圆偏振光子之间的时间延迟为检验爱因斯坦等效原理(EEP)提供了一种新的、有趣的方法。在本文中,我们限制EEP同时考虑夏皮罗时间延迟和法拉第旋转效应。我们继续寻找适合于测试EEP精度的天文源,并获得60个河外射电源在三个不同的无线电波段(20,8.6和4.8 GHz)和29个最亮的恒星在我们自己的银河系内的多色线性偏振数据在五个光学波段($UBVRI$)的多波长偏振角。我们应用Metropolis-Hastings马尔可夫链来模拟拟合参数。最终结果表明,对于60个射电源,参数化后牛顿参数$γ$差异($Δγ_{p}$)的值被限制在$10^{-26}-10^{-23}$的范围内,对于29颗光学偏振星,参数化后牛顿参数$γ$差异($Δγ_{p}$)的值被限制在$10^{-23}-10^{-20}$的范围内。与以往基于伽玛射线波段单偏振观测的EEP试验相比,我们的结果具有极大的优越性,可获得近几十个具有多波长偏振观测的天体物理源,通常在光学和无线电波段。它确保了这些源可以在EEP上给出更显著的鲁棒边界。虽然所提出的方法是简单的,由此产生的限制EEP应作为上限,因为其他更复杂的天体物理效应影响偏振旋转几乎没有考虑。

英文摘要:

The observed time delays between photons with different circular polarizations from an astrophysical object provide a new, interesting way of testing the Einstein Equivalence Principle (EEP). In this paper, we constrain the EEP by considering both Shapiro time delay and Faraday rotation effects. We continue to search for astronomical sources that are suitable for testing the EEP accuracy, and obtain 60 extragalactic radio sources with multi-wavelength polarization angles in three different radio bands (20, 8.6, and 4.8 GHz) and 29 brightest stars within our own Milky Way galaxy with multi-colour linear polarimetric data in five optical bands ($UBVRI$). We apply the Metropolis-Hastings Markov Chain to simulate the fit parameters. The final results show that the values of the parameterized post-Newtonian parameter $γ$ discrepancy ($Δγ_{p}$) are constrained to be in the range of $10^{-26}-10^{-23}$ for 60 radio sources and in the range of $10^{-23}-10^{-20}$ for 29 optical polarization stars. Compared to previous EEP tests that based on the single polarization measurement in the gamma-ray band, our results have profound superiority that nearly a few tens of astrophysical sources with multi-wavelength polarization observations commonly in the optical and radio bands are available. It ensures that these sources can give more significantly robust bounds on the EEP. Although the presented method is straightforward, the resulting constraints on the EEP should be taken as upper limits as other more complex astrophysical effects affecting a polarization rotation are hardly considered.

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