带电-PFDM黑洞周围薄吸积盘的辐射性质与光学外观

中文摘要 AI 辅助

在完美流体暗物质（PFDM）背景下，对磁荷黑洞的吸积为检验强场引力开辟了新窗口。本文研究了围绕带电-PFDM黑洞的薄吸积盘的辐射性质与光学外观。我们数值计算了辐射能通量、温度分布和辐射效率，并采用光线追踪方法构建了直接图像、次级图像、红移分布和观测通量。通过与史瓦西和纯PFDM情形比较，我们发现带电-PFDM黑洞的薄盘效率介于两者之间，磁荷部分抵消了暗物质引起的效率增强；对于M87*，效率估计为7%至8%。光学外观主要由PFDM参数主导，而磁荷仅起次要作用。更大的倾角产生更强的多普勒不对称性，形成特征性的“帽状”形状。这些结果为未来高分辨率观测（如ngEHT）提供了可证伪的预测，以区分暗物质环境与磁荷效应。

英文摘要

Accretion onto magnetically charged black holes in a perfect fluid dark matter (PFDM) background opens a new window for testing strong-field gravity. This paper investigates the radiative properties and optical appearance of a thin accretion disk surrounding a charged-PFDM black hole. We numerically compute the radiative energy flux, temperature distribution, and radiative efficiency, and employ a ray-tracing method to construct the direct images, secondary images, redshift distribution, and observed flux. By comparing with the Schwarzschild and pure PFDM cases, we find that the thin-disk efficiency of the charged-PFDM black hole lies between the two, with the magnetic charge partially counteracting the dark-matter-induced efficiency enhancement; for M87*, the efficiency is estimated to be 7\%--8\%. The optical appearance is predominantly governed by the PFDM parameter, while the magnetic charge plays only a marginal role. Larger inclination angles give rise to stronger Doppler asymmetry, producing the characteristic ``hat-like'' shape. These results provide falsifiable predictions for future high-resolution observations, such as those by ngEHT, to distinguish dark-matter environments from magnetic-charge effects.

发表机构

• Guizhou University（贵州大学）

机构由 AI 辅助整理，请以论文原文为准。