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arXiv 2012.05186gr-qchep-th
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从M87的事件视界望远镜观测看Einstein引力

Einstein-Æther Gravity in the light of Event Horizon Telescope Observations of M87*

Mohsen Khodadi, Emmanuel N. Saridakis

摘要:

我们利用最近的事件视界望远镜(EHT)对M87* 的观测研究了爱因斯坦-爱因斯坦引力。观测到的黑洞阴影的形状和大小包含了其附近的几何信息,因此可以将其视为研究不同引力理论的潜在探针,因为所涉及的计算框架丰富了不同的尺寸旋转特征以及额外的模型参数。在Einstein-Einther引力的情况下,黑洞解根据Einstein-Einther引力参数的不同分为两类.我们计算相应的光子有效势,不稳定的光子球半径,最后,诱导角的大小,结合质量和距离可以导致一个单一的预测,量化的黑洞阴影,即每单位质量的直径$d$。由于$d_{M87*}$是从EHT探针观测已知的,我们提取相应的参数区域,以获得一致性。我们发现Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einstein-Einste

英文摘要:

We investigate Einstein-Æther gravity in light of the recent Event Horizon Telescope (EHT) observations of the M87*. The shape and size of the observed black hole shadow contains information of the geometry in its vicinity, and thus one can consider it as a potential probe to investigate different gravitational theories, since the involved calculation framework is enriched with different size-rotation features as well as with extra model parameters. In the case of Einstein-Æther gravity the black hole solutions include two classes depending on the involved æther parameters. We calculate the corresponding photon effective potential, the unstable photon sphere radius, and finally, the induced angular size, which combined with the mass and the distance can lead to a single prediction that quantifies the black hole shadow, namely the diameter per unit mass $d$. Since $d_{M87*}$ is observationally known from the EHT Probe, we extract the corresponding parameter regions in order to obtain consistency. We find that Einstein-Æther black hole solutions agree with the shadow size of EHT M87*, if the involved Æther parameters are restricted within specific ranges, along with an upper bound on the dimensionless spin parameter $a$, which is verified by a full scan of the parameter space within $1σ$-error.

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