半经典引力中带迹反常的旋转黑洞周围Novikov-Thorne吸积盘的特征
Signatures of Novikov-Thorne accretion disks around rotating black holes in semiclassical gravity with trace anomaly
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中文总结 AI 辅助
本文研究半经典引力中带迹反常的旋转黑洞周围Novikov-Thorne吸积盘的热辐射特征，发现耦合参数抑制盘发射并降低光度，为区分半经典引力与广义相对论及约束耦合参数提供了观测途径。
中文摘要 AI 辅助
半经典引力通过由耦合参数表征的量子反作用为解决黑洞奇点问题提供了一个有前景的框架，因此彻底探索此类天体周围的吸积性质至关重要。本文在具有A型迹反常的半经典引力框架内，研究了不同参数空间中旋转黑洞周围Novikov-Thorne吸积盘的热辐射特征，重点关注能量通量密度、温度分布和热光度。我们的研究结果表明，耦合参数的引入抑制了盘发射，导致能量通量密度和温度的峰值均低于广义相对论中的Kerr对应值，同时热光度的峰值及其对应的峰值频率也更低。特别是，当黑洞具有高自旋时，这种差异变得非常显著。从机制上讲，增大耦合参数增强了中心致密天体的有效引力场强度，这将赤道稳定圆轨道向外推移，并增加了轨道物质的比能，从而降低了辐射效率并削弱了整体盘发射。这种抑制机制为区分半经典引力与广义相对论提供了一个实用的天体物理窗口，并可通过热盘光谱对耦合参数施加观测约束。
英文摘要
Semiclassical gravity provides a promising framework to address the black hole singularity problem through quantum backreaction characterized by a coupling parameter, making it essential to thoroughly explore the accretion properties around such objects. In this paper, within the framework of semiclassical gravity with type-A trace anomaly, we investigate the thermal radiative signatures of Novikov-Thorne accretion disks around rotating black holes across diverse parameter spaces, focusing on the energy flux density, temperature profile, and thermal luminosity. Our findings demonstrate that the introduction of the coupling parameter suppresses disk emission, leading to lower peak values of both energy flux density and temperature, as well as lower peak values and corresponding peak frequencies in thermal luminosity compared to their Kerr counterparts in general relativity. In particular, this discrepancy becomes remarkably pronounced when the black hole possesses a high spin. Mechanistically, increasing the coupling parameter reinforces the effective gravitational field strength of the central compact object, which pushes the equatorial stable circular orbits outward and increases the specific energy of the orbiting matter, thereby reducing the radiative efficiency and weakening the overall disk emission. This suppression mechanism offers a practical astrophysical window to distinguish semiclassical gravity from general relativity and to place observational constraints on the coupling parameter via thermal disk spectra.
发表机构
- School of Mathematics and Physics, University of South China（南华大学数学与物理学院）
- School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）
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