76 citations · 1k across the 55 of their papers we have counts for
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Loop quantum black hole
Xiangdong Zhang
In the last decades, progress on the quantization of black holes using techniques developed in loop quantum cosmology has received increasing attention. Due to the quantum geometry…
Gauss-Bonnet solution with a cloud of strings in de Sitter and anti-de Sitter space
Wenxi Zhai, Xiangdong Zhang
In this paper, we present exact spherically symmetric Gauss-Bonnet black hole solutions surrounded by a cloud of strings fluid with cosmological constant in dimensions. Both…
Quasinormal modes of the Bardeen black hole with a cloud of strings
Yunlong Liu, Xiangdong Zhang
We investigate the quasinormal mode and greybody factor of Bardeen black holes with a string clouds by WKB approximation and verify them by Prony algorithm. We found that the imagi…
Topological classes of black holes in de-Sitter spacetime
Yongbin Du, Xiangdong Zhang
In this paper, we investigate the topological number of de-Sitter black hole solutions with different charges and rotational parameters. By using generalized free energ…
Topological classes of BTZ black holes
Yongbin Du, Xiangdong Zhang
In the recent paper [Phys. Rev. Lett. 129, 191101 (2022)], the black holes were viewed as topological thermodynamic defects by using the generalized off-shell free energy. Their wo…
Loop quantum cosmological model from ADM Hamiltonian
You Ding, Xiangdong Zhang
The loop quantum cosmological model from ADM Hamiltonian is studied in this paper. We consider the spatially flat homogeneous FRW model. It turns out that the modified Friedmann eq…
Alternative loop quantum cosmology
Jinsong Yang, Cong Zhang, Xiangdong Zhang
An alternative quantization of the gravitational Hamiltonian constraint of the Friedmann-Robertson-Walker model is proposed by treating the Euclidean term and the Lorentzian…
Realization of Dirac quantization in loop quantum gravity
Xiangdong Zhang, Yongge Ma
The system of gravity coupled to the non-rotational dust field is studied at both classical and quantum levels. The scalar constraint of the system can be written in the form of a…
On the gauge reduction with respect to simplicity constraint in all dimensional loop quantum gravity
Gaoping Long, Xiangdong Zhang
In this paper, we are going to discuss the gauge reduction with respect to the simplicity constraint in both classical and quantum theory of all dimensional loop quantum gravity. W…
The thermodynamics of isolated horizons in loop quantum gravity
Shupeng Song, Gaoping Long, Cong Zhang +1
The statistical mechanical calculation of the thermodynamical properties of non-rotating isolated horizons are studied in the loop quantum gravity framework. By employing the Hawki…
Solar system constraints of a polymer black hole in loop quantum gravity
Yun-Long Liu, Zhao-Qing Feng, Xiang-Dong Zhang
A new polymer black hole solution in loop quantum gravity was proposed recently. The difference between the polymer black hole and Schwarzschild black hole is captured by a quantum…
Connections between the shadow radius and the quasinormal modes of Kerr-Sen black hole
Xianglong Wu, Xiangdong Zhang
The correspondence between the shadow radius and the quasi-normal modes of the Kerr-Sen black hole is studied. By using the equation of the shadow radius of the Kerr-Sen black hole…
Thermodynamics in new model of loop quantum cosmology
Xiangdong Zhang
The thermodynamic properties of loop quantum cosmology (LQC) without considering the Lorentz term were established in \cite{Zhu09}. In this paper, we extend this result to the rece…
Twisted geometry coherent states in all dimensional loop quantum gravity: I. Construction and Peakedness properties
Gaoping Long, Xiangdong Zhang, Cong Zhang
A new family of coherent states for all dimensional loop quantum gravity are proposed, which is based on the generalized twisted geometry parametrization of the phase space of $SO(…
Collisional Penrose process with spinning particles in braneworld black hole
Yongbin Du, Yunlong Liu, Xiangdong Zhang
The Penrose process of an extremal braneworld black hole is studied. We analyze the Penrose process by two massive spinning particles collide near the horizon. By calculating the m…
Loop quantum deparametrized Schwarzschild interior and discrete black hole mass
Cong Zhang, Yongge Ma, Shupeng Song +1
We present the detailed analyses of a model of loop quantum Schwarzschild interior coupled to a massless scalar field and extend the results in our previous rapid communication arX…
Superposition type coherent states in all dimensional loop quantum gravity
Gaoping Long, Cong Zhang, Xiangdong Zhang
We propose a new kind of coherent state for the general formulation of loop quantum gravity in the -dimensional space-time. Instead of Thiemann's coherent state fo…
Loop quantum gravity and cosmological constant
Xiangdong Zhang, Gaoping Long, Yongge Ma
An one-parameter regularization freedom of the Hamiltonian constraint for loop quantum gravity is analyzed. The corresponding spatially flat, homogenous and isotropic model include…
Energy conditions in new model of loop quantum cosmology
Gaoping Long, Yunlong Liu, Xiangdong Zhang
Recently, a de-Sitter epoch has been found in the new model of loop quantum cosmology which is governed by the scalar constraint with both of Euclidean and Lorentz terms. The singu…
Collisional Penrose process of BTZ black holes
Xianglong Wu, Xiangdong Zhang
The Penrose process in the vicinity of an extremal Banãdos-Teitelboim-Zanelli(BTZ) black hole is studied. Due to the existence of negative cosmological constant, only massless part…
Canonical loop quantization of the lowest-order projectable Horava gravity
Xiangdong Zhang, Jinsong Yang, Yongge Ma
The Hamiltonian formulation of the lowest-order projectable Horava gravity, namely the so-called - gravity, is studied. Since a preferred foliation has been chosen in project…
Loop quantum Schwarzschild interior and black hole remnant
Cong Zhang, Yongge Ma, Shupeng Song +1
The interior of Schwarzschild black hole is quantized by the method of loop quantum gravity. The Hamiltonian constraint is solved and the physical Hilbert space is obtained in the…
Collision of spinning particles near BTZ black holes
Xulong Yuan, Yunlong Liu, Xiangdong Zhang
We study the collision property of spinning particles near a Bañados-Teitelboim-Zanelli (BTZ) black hole. Our results show that although the center-of-mass energy of two ingoing pa…
Quantum geometry and effective dynamics of Janis-Newman-Winicour singularities
Cong Zhang, Xiangdong Zhang
Inspired by the recent proposal for the quantum effective dynamics of the Schwarzschild spacetime given in \cite{AOS1}, we investigate the effective dynamics of the loop quantized…