Observational signatures of rotating black holes in the semiclassical gravity with trace anomaly  

作　　者：Zhenyu Zhang Yehui Hou Minyong Guo 张震宇;侯业辉;郭敏勇

机构地区：[1]Department of Physics,Peking University,Beijing 100871,China [2]Department of Physics,Beijing Normal University,Beijing 100875,China

出　　处：《Chinese Physics C》2024年第8期257-265,共9页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(12275004,12205013,11873044);"the Fundamental Research Funds for the Central Universities"(2021NTST13)。

摘　　要：In a recent work by Fernandes[Phys.Rev.D 108(6),L061502(2023)],an exact stationary and axisymmetric solution was discovered in semiclassical gravity with type-A trace anomaly.This was identified as a quantum-corrected version of the Kerr black hole.In this study,we explore the observational signatures of this black hole solution.Our investigation reveals that prograde and retrograde light rings exist,whose radii increase monotonically with the coupling parameterα.Whenαis negative,the shadow area for the quantum-corrected black hole is smaller than that of the Kerr black hole,whereas whenαis positive,the area is larger.For a near-extremal black hole,its high-spin feature(the NHEKline)is found to be highly susceptible to disruption byα.Furthermore,we discuss the images of the quantum-corrected black hole in the presence of a thin accretion disk and compare them to those of the Kerr black hole.Our study highlights the importance of near-horizon emission sources in detecting the effects of quantum corrections by black hole images.

关 键 词：quantum-corrected rotating black hole light rings black hole shadow 

分 类 号：P145.8[天文地球—天体物理]