87 citations · 319 across the 17 of their papers we have counts for
17 papers
Resonant bound orbits and kludge waveforms in rotating Konoplya-Zhidenko black hole spacetime
Qiyu Dai, Xiongjun Fang, Xiao-Mei Kuang +1
We investigate timelike bound motion, resonant periodic orbits, and their gravitational-wave signatures in the rotating Konoplya-Zhidenko (KZ) black hole spacetime. Using the separ…
Kerr-MOG-(A)dS black hole and its shadow in scalar-tensor-vector gravity theory
Wentao Liu, Di Wu, Xiongjun Fang +2
The scalar-tensor-vector gravity (STVG) theory has attracted significant interest due to its ability to effectively address the issue of galaxy rotation curves and clusters of gala…
Lorentz violation induces isospectrality breaking in Einstein-Bumblebee gravity theory
Wentao Liu, Xiongjun Fang, Jiliang Jing +1
In this paper, we investigate the quasinormal modes (QNMs) of a Lorentz-violating spacetime, factoring in a cosmological constant, within the framework of Einstein-Bumblebee gravit…
Gravito-electromagnetic perturbations of MOG black holes with a cosmological constant: Quasinormal modes and Ringdown waveforms
Wentao Liu, Xiongjun Fang, Jiliang Jing +1
In this paper, we present a black hole solution with a cosmological constant in the Scalar-Tensor-Vector Modified Gravity (MOG) theory, where the strength of the gravitational cons…
The Quasinormal Modes and Isospectrality of Bardeen (Anti-) de Sitter Black Holes
Ying Zhao, Wentao Liu, Chao Zhang +2
Black holes (BHs) exhibiting coordinate singularities but lacking essential singularities throughout the entire spacetime are referred to as regular black holes (RBHs). The initial…
QNMs of slowly rotating Einstein-Bumblebee Black Hole
Wentao Liu, Xiongjun Fang, Jiliang Jing +1
We have studied the quasinormal modes (QNMs) of a slowly rotating black hole with Lorentz-violating parameter in Einstein-bumblebee gravity. We analyse the slow rotation approximat…
Imprints of dark matter on gravitational ringing of supermassive black holes
Chao Zhang, Tao Zhu, Xiongjun Fang +1
Gravitational waves emitted from the gravitational ringing of supermassive black holes are important targets to test general relativity and probe the matter environment surrounding…
Gauge Invariant Perturbations of General Spherically Symmetric Spacetimes
Wentao Liu, Xiongjun Fang, Jiliang Jing +1
In this paper, the gauge choices in general spherically symmetric spacetimes have been explored. We construct the gauge invariant variables and the master equations for both the De…
Universality of entropy principle for a general diffeomorphism-covariant purely gravitational theory
Jie Jiang, Xiongjun Fang, Sijie Gao
Thermodynamics plays an important role in gravitational theories. It is a principle independent of the gravitational dynamics, and there is still no rigorous proof to show that it…
Consistency between dynamical and thermodynamical stabilities for charged self-gravitating perfect fluid
Wei Yang, Xiongjun Fang, Jiliang Jing
The entropy principle shows that, for self-gravitating perfect fluid, the Einstein field equations can be derived from the extrema of the total entropy, and the thermodynamical sta…
Gravitational wave cosmology I: high frequency approximation
Jared Fier, Xiongjun Fang, Bowen Li +3
In this paper, we systematically study gravitational waves (GWs) produced by remote compact astrophysical sources. To describe such GWs properly, we introduce three scales, $λ, \;…
Consistency between dynamical and thermodynamical stabilities for perfect fluid in theories
Xiongjun Fang, Xiaokai He, Jiliang Jing
We investigate the stability criterions for perfect fluid in theories which is an important generalization of general relativity. Firstly, using Wald's general variation pri…
Thermodynamical stability for perfect fluid
Xiongjun Fang, Xiaokai He, Jiliang Jing
According to maximum entropy principle, it has been proved that the gravitational field equations could be derived by the extrema of total entropy for perfect fluid, which implies…
General proof of the entropy principle for self-gravitating fluid in f(R) Gravity
Xiongjun Fang, Minyong Guo, Jiliang Jing
The discussions on the connection between gravity and thermodynamics attract much attention recently. We consider a static self-gravitating perfect fluid system in gravity,…
Proof of entropy principle in Einstein-Maxwell theory
Xiongjun Fang, Sijie Gao
We consider a static self-gravitating charged perfect fluid system in the Einstein-Maxwell theory. Assume Maxwell's equation and the Einstein constraint equation are satisfied, and…
General proof of the entropy principle for self-gravitating fluid in static spacetimes
Xiongjun Fang, Sijie Gao
We show that for any perfect fluid in a static spacetime, if the Einstein constraint equation is satisfied and the temperature of the fluid obeys Tolman's law, then the other compo…
Glueball Masses in QCD_3
Qi-Zhou Chen, Xiang-Qian Luo, Shuo-Hong Guo +1
We discuss how to extract the spectroscopy of quantum chromodynamics (QCD) in the pure gauge sector from the Hamiltonian lattice field theory approach. The recently developed trunc…