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arXiv 2401.08693gr-qc
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Rastall引力中弦云环绕的Kerr黑洞阴影及来自M87*的约束

Shadow of Kerr black hole surrounded by a cloud of strings in Rastall gravity and constraints from M87*

Qi Sun, Yu Zhang, Chen-Hao Xie, Qi-Quan Li

AI总结:

本文研究Rastall引力中弦云环绕的Kerr黑洞阴影,利用M87*的EHT观测约束参数$a$、$a_0$和$β$,证明该类黑洞可作为真实天体物理黑洞候选体。

摘要:

受事件视界望远镜(EHT)拍摄到的首张黑洞图像推动,利用黑洞阴影观测来检验引力理论的研究大量涌现。本文开展了一项与Rastall引力中弦云环绕的Kerr黑洞阴影相关的研究。由于弦参数$a_0$和参数$β$的存在,该黑洞偏离了标准Kerr黑洞。文中展示了该黑洞的视界、能层和光子区域。此外,我们探讨了黑洞的阴影及其观测特征,这些特征与参数$a_0$和$β$密切相关。通过将M87*视为Rastall引力下弦云环绕的Kerr黑洞,我们利用EHT观测对黑洞参数进行了约束。对于给定的$β$,黑洞的圆度偏差在所有区域均满足$ΔC\lesssim0.1$。角直径$θ_{d}=42\pm3μas$为固定$β$时的参数$a$和$a_0$提供了上界。对于给定的$β$,阴影轴比在整个空间内满足EHT的观测数据($1<D_x\lesssim4/3$)。这些结果与EHT公开信息一致。换言之,真实天体物理黑洞的候选体可以是Rastall引力中弦云环绕的Kerr黑洞。

英文摘要:

Motivated by the first image of a black hole captured by the Event Horizon Telescope (EHT), there has been a surge of research using observations of black hole shadows to test theories of gravity. In this paper, we carry out a study related to the shadow of Kerr black holes surrounded by a cloud of strings in Rastall gravity, which deviates from the Kerr black hole due to the presence of the string parameter $a_0$ and the parameter $β$. The horizons, ergospheres, and photon region of the black hole are shown. Moreover, we explore the shadow and observations of the black hole, which are closely linked to the parameters $a_0$ and $β$. By treating \text{M87*} as a Kerr black hole surrounded by a cloud of strings under Rastall gravity, we constrain the black hole parameters using the EHT observations. For a given $β$, the circularity deviation of the black hole obeys $ΔC\lesssim0.1$ in all regions. The angular diameter $θ_{d}=42\pm3μas$ provides the upper bound of parameters $a$ and $a_0$ for fixed $β$. The shadow axis ratio satisfies the observation data of EHT ($1<D_x\lesssim4/3$) in the whole space for a given $β$. These results are consistent with the public information from EHT. In other words, candidates for real astrophysical black holes can be Kerr black holes surrounded by a cloud of strings in Rastall gravity.

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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