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Signatures of Novikov-Thorne accretion disks around rotating black holes in semiclassical gravity with trace anomaly
Yuxiang Zuo, Shiyang Hu, Dan Li +3
Semiclassical gravity provides a promising framework to address the black hole singularity problem through quantum backreaction characterized by a coupling parameter, making it ess…
Construction of an analytic multi-component accretion environment and its application to Kerr black hole imaging
Shiyang Hu, Dan Li, Chen Deng +2
The construction of accretion environments is fundamental to black hole imaging. From a purely geometric perspective, we construct a novel analytic accretion environment comprising…
Rational Orbits and Gravitational Waves in Static Spherical Spacetimes: An Open-Source Numerical Framework
Dan Li, Shiyang Hu, Chen Deng +2
Timelike orbits constitute a crucial probe for exploring the intrinsic properties of curved spacetimes, and the carried gravitational radiation signals provide a direct window into…
Reshaping the inner shadow of a Kerr black hole by a torn accretion disk
Shiyang Hu, Dan Li, Chen Deng +1
When an accretion flow extends to the event horizon, their intersection defines the contour of the inner shadow. However, the morphological evolution of this critical feature remai…
Gravitational emissions and light curves of quasi-periodic orbits in Schwarzschild spacetime embedded in a Dehnen-type dark matter halo
Shijie Tan, Chunhua Jiang, Dan Li +3
Timelike orbits in curved spacetimes encode intrinsic information about the background geometry and serve as critical probes for investigating gravitational theories and source dis…
OCTOPUS: A Versatile, User-Friendly, and Extensible Public Code for General-Relativistic Ray-Tracing in Spherically Symmetric and Static Spacetimes
Shiyang Hu, Shijie Tan, Dan Li +3
This paper presents OCTOPUS, a relativistic ray-tracing algorithm developed within a Fortran-based, OpenMP-accelerated framework, designed for asymptotically flat, spherically symm…
Light Curves of Chaotic Charged Hot-Spots in Curved Spacetime: Opening an Observational Window to Chaos
Shiyang Hu, Dan Li, Chen Deng
The observed scarcity of chaotic phenomena in astronomy contrasts sharply with their theoretical significance, primarily due to the absence of a robust framework for detecting chao…
Influence of the external electromagnetic field on the properties of the Novikov-Thorne accretion disk in Kerr spacetime
Shiyang Hu, Yuxiang Zuo, Dan Li +1
The Novikov-Thorne accretion disk model is widely employed in astrophysics, yet computing its blackbody spectrum theoretically requires analytical expressions for the orbital param…
Shadows of three black holes in static equilibrium configuration
Dan Li, Yuxiang Zuo, Shiyang Hu +3
In this paper, we employ a ray-tracing algorithm to simulate the shadows of three equal-mass black holes in static equilibrium across a wide parameter space. We find that the shado…
Novel inner shadows of the Kerr black hole with a tilted thin accretion disk
Shiyang Hu, Dan Li, Chen Deng
The inner shadow of a black hole, as a projection of the event horizon, is regarded as a potential tool for testing gravitational theories and constraining system parameters. Wheth…