非线性电动力学中双荷黑洞的观测特征
Observational Signatures of Dyonic Black Holes in Non-Linear Electrodynamics
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中文总结 AI 辅助
该研究分析非线性电动力学中双荷黑洞的吸积光谱与轨道特征，通过EHT的Sgr A*数据验证，发现其模型与实验数据统计一致，且NLED会收缩ISCO半径并提高局部有效温度。
中文摘要 AI 辅助
我们研究非线性电动力学（NLED）中静态球对称双荷黑洞的薄盘吸积及发射光谱的观测特征。与电磁对偶假设电荷相等的经典麦克斯韦理论不同，NLED中的耦合参数引入了新的引力势，并修改了强场区域的几何结构。我们还研究了圆轨道上粒子的运动学特征，如角速度、比能量和比角动量。研究发现，NLED的修改会导致最内稳定圆轨道（ISCO）半径收缩，使辐射光谱的热最大值向更小半径移动，进而与标准史瓦西和雷斯勒-诺德斯特龙解相比，局部有效温度升高。此外，我们计算零测地线轨道以确定光子球和黑洞阴影的光学边缘。为评估上述替代模型的观测有效性，我们通过事件视界望远镜（EHT）针对人马座A*（Sgr A*）收集的视界尺度角直径约束进行了χ²拟合优度检验，证明双荷NLED模型和纯磁模型均与实验数据具有良好的统计一致性。
英文摘要
We study the observational features of thin-disk accretion and emission spectra for static, spherically symmetric dyonic black holes in non-linear electrodynamics (NLED). In contrast to classical Maxwell theory, where electromagnetic duality assumes equal charges, the coupling parameters in NLED introduce a new gravitational potential and modify the geometry in the strong-field regime. We also study the kinematic characteristics of particles on circular orbits, such as their angular velocity, specific energy, and specific angular momentum. It is found that modifications of NLED lead to a shrinkage of the ISCO radius, resulting in a shift of the radiation spectrum thermal maximum towards smaller radii and, consequently, an increase in the local effective temperature in comparison with the standard Schwarzschild and Reissner-Nordström solutions. Additionally, we compute null-geodesic orbits to determine the optical edge of both the photon sphere and the black hole shadow. In order to assess the observational validity of the aforementioned alternatives, we carry out a $χ^2$ goodness-of-fit test through the angular diameter constraints at the horizon scale collected by the Event Horizon Telescope (EHT) concerning Sagittarius A* ($\text{Sgr A}^*$). We prove that both these dyonic NLED and purely magnetic models have good statistical agreement with experimental data.
发表机构
- School of Physics, Beijing Institute of Technology（北京理工大学物理学院）
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