Showing 2020 · gr-qcShow all

35 papers · 2 filters

gr-qc2020★ 135 cited

QED Effect on Black Hole Shadow

Zezhou Hu, Zhen Zhong, Peng-Cheng Li +2

In this work, taking the QED effect into account, we investigate the shadows of the static black hole with magnetic monopoles and neutral black holes in magnetic fields through the…

gr-qc2020★ 60 cited

Primordial black holes and secondary gravitational waves from natural inflation

Qing Gao, Yungui Gong, Zhu Yi

The production of primordial black hole (PBH) dark matter (DM) and the generation of scalar induced secondary gravitational waves by using the enhancement mechanism with a peak fun…

gr-qc2020★ 4 cited

Consistency of a kind of general noncanonical warm inflation

Xiao-Min Zhang, Ang Fu, Kai Li +4

The framework of a kind of noncanonical warm inflation is introduced, and the dynamical equations of this scenario are presented. We propose the slow roll approximations and give s…

gr-qc2020★ 13 cited

Geometric parametrization of phase space of all dimensional loop quantum gravity

Gaoping Long, Chun-Yen Lin

To clarify the geometric information encoded in the spin-network states for the higher dimensional loop quantum gravity, we generalize the twisted-geometry parametrizatio…

gr-qc2020★ 92 cited

Universal Properties of Light Rings for Stationary Axisymmetric Spacetimes

Minyong Guo, Sijie Gao

Light rings (LRs) play an important role in gravitational wave observations and black hole photographs. In this paper, we investigate general features of LRs in stationary, axisymm…

gr-qc2020★ 61 cited

Shadows of the accelerating black holes

Ming Zhang, Jie Jiang

Due to the acceleration of the black hole, the circular orbits of the photons will deviate from the equatorial plane and the property of the black hole shadow will change. We find…

gr-qc2020★ 8 cited

Weak cosmic censorship conjecture in higher-dimensional black holes with nonlinear electrodynamic sources

Zhen Li, Yunjiao Gao, Xiao-Kan Guo

The new version of the gedanken experiments proposed by Sorce and Wald are designed to test the validity of the weak cosmic censorship conjecture (WCCC) by overspinning or overchar…

gr-qc2020★ 5 cited

Loop quantum cosmology from an alternative Hamiltonian. II. Including the Lorentzian term

Jinsong Yang, Cong Zhang, Yongge Ma

The scheme of using the Chern-Simons action to regularize the gravitational Hamiltonian constraint is extended to including the Lorentzian term in the cosmological model. The…

gr-qc2020★ 10 cited

Cosmological consequences of a scalar field with oscillating equation of state. II. Oscillating scaling and chaotic accelerating solutions

S. X. Tian

Multiacceleration scenario can be used to solve the cosmological coincidence problem. In this paper, after considering the early radiation era, we revisit the cosmological dynamics…

gr-qc2020★ 19 cited

Polytopes in all dimensional loop quantum gravity

Gaoping Long, Yongge Ma

The Lasserre's reconstruction algorithm is extended to the D-polytopes with the construction of their shape space. Thus, the areas of d-skeletons can be expressed…

gr-qc2020★ 13 cited

The Reconstruction of Non-Minimal Derivative Coupling Inflationary Potentials

Qin Fei, Zhu Yi, Yingjie Yang

We derive the reconstruction formulae for the inflation model with the non-minimal derivative coupling term. If reconstructing the potential from the tensor-to-scalar ratio, we cou…

gr-qc2020★ 12 cited

New version of the gedanken experiments to test the weak cosmic censorship in charged dilaton-Lifshitz black holes

Jie Jiang, Ming Zhang

In this paper, based on the new version of the gedanken experiments proposed by Sorce and Wald, we examine the weak cosmic censorship in the perturbation process of accreting matte…

gr-qc2020★ 7 cited

Investigating the Linearized Second Law in Horndeski Gravity

Xin-Yang Wang, Jie Jiang

Since the entropy of stationary black holes in Horndeski gravity will be modified by the non-minimally coupling scalar field, a significant issue of whether the Wald entropy still…

gr-qc2020★ 1 cited

Equiaffine braneworld

Fan Zhang

Higher dimensional theories, wherein our four dimensional universe is immersed into a bulk ambient, have received much attention recently, and the direction of investigation had, a…

gr-qc2020

Revisiting collisional Penrose processes in term of escape probabilities for spinning particles

Ming Zhang, Jie Jiang

We first study the escape probability of the spinning particle emitted from the Kerr black hole and find that the escape probability increases with the spin of the particle around…

gr-qc2020★ 10 cited

Testing the Weak Cosmic Censorship Conjecture in Lanczos-Lovelock gravity

Jie Jiang, Ming Zhang

In this paper, we test the weak cosmic censorship conjecture (WCCC) in the nearly extremal static charged black holes of Lanczos-Lovelock-Maxwell gravity based on the new version o…

gr-qc2020★ 22 cited

"Conserved charges" of the Bondi-Metzner-Sachs algebra in the Brans-Dicke theory

Shaoqi Hou, Zong-Hong Zhu

The asymptotic symmetries in Brans-Dicke theory are analyzed using Penrose's conformal completion method, which is independent of the coordinate system used. These symmetries indee…

gr-qc2020★ 11 cited

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…

gr-qc2020

Mechanics of Isolated Horizons in Scalar-Tensor Theories

Shupeng Song, Yongge Ma

Based on the first-order action for scalar-tensor theories with the Immirzi parameter, the symplectic form for the spacetimes admitting a weakly isolated horizon as internal bounda…

gr-qc2020★ 54 cited

Primordial black holes and secondary gravitational waves from the Higgs field

Zhu Yi, Yungui Gong, Bin Wang +1

We devise a novel mechanism and for the first time demonstrate that the Higgs model in particle physics can drive the inflation to satisfy the cosmic microwave background observati…

gr-qc2020★ 16 cited

Perelomov type coherent states of SO(D + 1) in all dimensional loop quantum gravity

Gaoping Long, Norbert Bodendorfer

A comprehensive study of the application of SO coherent states of Perelomov type to loop quantum gravity in general spacetime dimensions is given in this paper.…

gr-qc2020★ 57 cited

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…

gr-qc2020★ 5 cited

Relaxation rate of RNdS black hole

Ming Zhang, Jie Jiang, Zhen Zhong

We investigate the relaxation rate of the RNdS black hole perturbed by neutral massless scalar field in the eikonal limit. We find that the fastest relaxation rate of the composed…

gr-qc2020★ 45 cited

Gravitational memory effects and Bondi-Metzner-Sachs symmetries in scalar-tensor theories

Shaoqi Hou, Zong-Hong Zhu

The relation between gravitational memory effects and Bondi-Metzner-Sachs symmetry of the asymptotically flat spacetimes is studied in the scalar-tensor theory. For this purpose, t…