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arXiv 2602.07923gr-qc
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以色列接合II:缓慢旋转 Kerr 空间中薄壳的双光子环

Signatures of the Israel Junction II: Double Photon Rings in Slowly Rotating Kerr Spacetime with Thin Shell

Ningbo University(宁波大学);University of Science and Technology of China(中国科学技术大学)

Long-Yue Li, Li-Ming Cao, Yungui Gong, Xia-Yuan Liu, Wenting Zhou

AI总结:

研究缓慢旋转 Kerr 空间中薄壳对光子环的影响,发现光子环可逐渐合并为单环,且阴影边界与光子环无一一对应关系。

摘要:

将接合条件应用于缓慢旋转 Kerr 空间中的薄壳,当忽略自旋参数 a 的高阶项时,发现光子穿过壳时角动量 L 和卡特常数 C 保持不变,但能量 E 发生变化。因此,光子的冲击参数 η=L/E 和 ξ= C/E² 在壳处中断。利用此变换,研究了该空间的阴影及赤道薄吸积盘的图像。壳的存在使观测图像出现显著特征。值得注意的是,我们观察到图像中明显的双光子环,这些环可以逐渐合并为单个环。此外,阴影边界和光子环并不呈现一一对应关系。红移因子的突然变化和截断的光子区域深刻影响图像,产生如阶梯状结构等显著特征。这些特征在有壳的空间中可以帮助通过未来的天文观测评估以色列接合条件和壳模型在真实天体系统中的适用性。

英文摘要:

Applying the junction conditions to the slowly rotating Kerr spacetime with a thin shell, when higher order terms in the spin parameter a can be neglected, we find that while the angular momentum $L$ and Carter constant $C$ of the ray remain unchanged upon crossing the shell, its energy $E$ does not. Consequently, the impact parameters $η=L/E$ and $ξ=C/E^2$ of the ray are discontinued at the shell. Utilizing this transformation, we study the shadow of this spacetime and the corresponding images from an equatorial thin accretion disk. The presence of the shell gives rise to distinctive features in the observed images. Notably, we observe distinct double photon rings in the images, which can gradually merge into a single ring. Moreover, the shadow boundaries and the photon rings do not exhibit a one-to-one correspondence. The abrupt changes in redshift factor and the truncated photon regions profoundly influence the image, producing distinctive features such as the step-like structures. These features in shell-equipped spacetimes can help evaluate, through future astronomical observations, the applicability of the Israel junction condition and the shell model in real astrophysical systems.

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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