Dao-Jun Liu
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Dynamics of photons and shadows for black holes haired with parity-odd fields Open
A bstract Strong self-gravitational fields enable the realization of macroscopic odd-parity quantum objects. Using ray-tracing methods, we systematically analyze the dynamics of photons and the shadow features of rotating black holes with …
Lensing and light rings of parity-odd rotating boson stars Open
We obtain the first image of a parity-odd celestial body. Recently, an intriguing parity-odd rotating boson star was proposed. We investigate the lensing effects of these stars in detail. Our analysis demonstrates distinct gravitational di…
Complexity factor for a static self-gravitating sphere in Rastall-Rainbow gravity Open
We generalized Herrera's definition of complexity factor for static spherically symmetric fluid distributions to Rastall-Rainbow theory of gravity. For this purpose, an energy-dependent equation of motion is employed in accordance with the…
Tidal Love numbers of a nonexotic compact object with a thin shell Open
As a possible alternative to black holes, horizonless compact objects have significant implications for gravitational-wave physics. In this work, we utilize the standard linearized theory of general relativity to calculate the quadrupolar …
Novel black holes in higher derivative gravity Open
We find a class of novel black holes in higher derivative theory. The novel black holes follow behavior of~\sch\ ones at large mass limit, while dramatically differentiate from ~\sch\ ones for little holes because of the effects which may …
Tidal Deformability of Neutron Stars in Unimodular Gravity Open
Unimodular gravity is a modified theory with respect to general relativity by an extra condition that the determinant of the metric is fixed. Especially, if the energy-momentum tensor is not imposed to be conserved separately, a new geomet…
Tidal Deformability of Neutron Stars in Unimodular Gravity Open
Unimodular gravity is a modified theory with respect to general relativity by an extra condition that the determinant of the metric is fixed. Especially, if the energy-momentum tensor is not imposed to be conserved separately, a new geomet…
Accretion of the relativistic Vlasov gas onto a Bardeen regular black hole Open
We investigate the stationary, spherically symmetric accretion of the collisionless Vlasov gas onto a Bardeen regular black hole. Compared with previous studies, we propose a model in which the total angular momentum of the gas particles i…
Strong gravitational lensing of a 4D Einstein-Gauss-Bonnet black hole in homogeneous plasma Open
We investigate the strong gravitational lensing of spherically symmetric black holes in the novel Einstein-Gauss-Bonnet(EGB) gravity surrounded by unmagnetised plasma medium. The deflection angle in the strong deflection limit in EGB space…
Revisiting the stability of spontaneously scalarized black holes from the perspective of thermodynamics Open
It is recently shown that, besides the Schwarzshcild black hole solution, there exist also scalarized black hole solutions in some Einstein-scalar-Gauss-Bonnet theories. In this paper, we construct analytical expressions for the metric fun…
Analytically approximated scalarized black holes and their thermodynamic stability Open
It is recently shown that, besides the Schwarzshcild black hole solution, there exist also scalarized black hole solutions in some Einstein-scalar-Gauss-Bonnet theories. In this paper, we construct analytical expressions for the metric fun…
Scalar perturbations on the background of Kerr black holes in the quadratic dynamical Chern-Simons gravity Open
We study the scalar perturbation on the background of a Kerr black hole in the dynamical Chern-Simons modified gravity with a quadratic coupling between the scalar field and Chern-Simons term. In particular, the late-time tails of scalar p…
Instability for massive scalar fields in Kerr-Newman spacetime Open
It is known that a massive charged scalar field can trigger a superradiant instability in the background of a Kerr-Newman black hole. In this paper, we present a numerical study of such an instability by using the continued fraction method…
Revisiting the shadow of a black hole in the presence of a plasma Open
We study the photon’s motion around a black hole in the presence of a plasma whose density is a function of the radius coordinate by a renewed ray-tracing algorithm and investigate the influence of the plasma on the shadow of the black hol…
Massive charged Dirac fields around Reissner-Nordström black holes: quasibound states and long-lived modes Open
The behavior of a massive charged test Dirac field in the background of a Reissner-Nordström black hole is investigated. Especially, we obtain the frequencies of quasibound states by solving the Dirac equation numerically both in time and …
Scalar clouds and the superradiant instability regime of Kerr-Newman black hole Open
In this paper, we study a physical system that is composed of massive charged\nscalar field linearly coupled to a charged rotating Kerr-Newman black hole.\nGiven the parameters of black hole and a specific set of "quantum" numbers, the\npa…
Superradiant instability of $D$-dimensional Reissner-Nordström-anti-de Sitter black hole mirror system Open
In this paper, a detailed analysis for superradiant stability of the system composed by a $D$-dimensional Reissner-Nordström-anti-de Sitter (RN-AdS) black hole and a reflecting mirror under charged scalar perturbations are presented in the…
Charged scalar perturbations around a regular magnetic black hole Open
We study charged scalar perturbations in the background of a regular magnetic black hole. In this case, the charged scalar perturbation does not result in superradiance. By using careful time-domain analysis, we show that the charge of sca…