非旋转黑洞时空中的相对论球对称吸积：天体物理意义
Relativistic Spherical Accretion in Nonrotating Black Hole Spacetimes: Astrophysical Implications
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中文总结 AI 辅助
本研究系统分析十三种非旋转黑洞时空的球对称吸积流，推广Michel解，发现暗能量抑制而正则时空增强吸积，并提供拟合公式及对Sgr A*、M87*和GW190521的应用。
中文摘要 AI 辅助
我们对十三种非旋转黑洞时空中的球对称吸积流进行了系统分析，这些时空包括带电黑洞和正则黑洞、标量场和膨胀子场、暗能量、宇宙学常数、修正引力以及参数化度规。我们将Michel解推广到任意对角时空，并研究了密度、温度、速度、马赫数、质量吸积率和轫致辐射光度平衡剖面。以Schwarzschild解为参考，我们发现吸积流存在显著偏差，其中宇宙学常数和暗能量模型强烈抑制吸积，而正则和类Yukawa时空通常增强吸积。我们提供了吸积率和光度作为时空参数函数的拟合公式。随后，我们探讨了两个天体物理应用：对超大质量黑洞（如Sgr A*和M87*）的吸积，以及与GW190521引力波事件相关的中间质量黑洞的推断前身质量。我们发现观测不确定性可能使我们能够探测偏离Schwarzschild时空的特征。
英文摘要
We present a systematic analysis of spherically symmetric accretion flows onto thirteen non-rotating black hole spacetimes, including charged and regular black holes, scalar and dilaton fields, dark energy, cosmological constants, modified gravity, and parametrized metrics. We generalize the Michel solution to arbitrary diagonal spacetimes and investigate the density, temperature, velocity, Mach number, mass accretion rate, and bremsstrahlung luminosity equilibrium profiles. Using the Schwarzschild solution as a reference, we find significant deviations in the accretion flow, with cosmological-constant and dark-energy models strongly suppressing accretion, while regular and Yukawa-like spacetimes generally enhance it. We provide fitting formulas for the accretion rates and luminosities as functions of the spacetime parameters. We then explore two astrophysical applications: accretion onto supermassive black holes, such as Sgr A* and M87*, and the inferred progenitor masses of the intermediate-mass black holes associated with the GW190521 gravitational wave event. We find that observational uncertainties may allow us to probe signatures of deviations from the Schwarzschild spacetime.
发表机构
- Instituto de Astronomía, Universidad Nacional Autónoma de México（墨西哥国立自治大学天文学研究所）
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