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18 papers · 2 filters
Constraints on Hořava-Lifshitz gravity from GRB 170817A
Tao Zhang, Fu-Wen Shu, Qing-Wen Tang +1
In this work we focus on a toy model: (3+1)-dimensional Hořava-Lifshitz gravity coupling with an anisotropic electromagnetic (EM) field which is generated through a Kaluza-Klein re…
Acceleration radiation of an atom freely falling into a Kerr black hole and near-horizon conformal quantum mechanics
A. Azizi, H. E. Camblong, A. Chakraborty +2
An atom falling freely into a Kerr black hole in a Boulware-like vacuum is shown to emit radiation with a Planck spectrum at the Hawking temperature. For a cloud of falling atoms w…
Curvature Invariants for the Alcubierre and Natário Warp Drives
Brandon Mattingly, Abinash Kar, Matthew Gorban +9
A process for using curvature invariants is applied to evaluate the metrics for the Alcubierre and the Natario warp drives at a constant velocity.Curvature invariants are independe…
Rotations of the polarization of a gravitational wave propagating in Universe
Jia-Xi Feng, Fu-Wen Shu, Anzhong Wang
In this paper, we study the polarization of a gravitational wave (GW) emitted by an astrophysical source at a cosmic distance propagating through the Friedmann-Lemaître-Robertson-W…
Object picture of scalar field perturbation on Kerr black hole in scalar-Einstein-Gauss-Bonnet theory
Shao-Jun Zhang, Bin Wang, Anzhong Wang +1
Scalar perturbations around the Kerr black hole in scalar-Einstein-Gauss-Bonnet (sEGB) theory are studied in the time domain. To overcome the "outer boundary problem" that usually…
Curvature Invariants for the Accelerating Natario Warp Drive
B. Mattingly, A. Kar, M. Gorban +9
A process for using curvature invariants is applied to evaluate the accelerating Natario warp drive. Curvature invariants are independent of coordinate bases and plotting the invar…
Quasinormal modes, quasiperiodic oscillations and shadow of rotating regular black holes in non-minimally coupled Einstein-Yang-Mills theory
Kimet Jusufi, Mustapha Azreg-Aïnou, Mubasher Jamil +3
In this paper we obtain an effective metric describing a regular and rotating magnetic black hole (BH) solution with a Yang-Mills electromagnetic source in Einstein-Yang-Mills (EYM…
Properties of the spherically symmetric polymer black holes
Wen-Cong Gan, Nilton O. Santos, Fu-Wen Shu +1
In this paper we systematically study a five-parameters class of spherically symmetric polymer black/white hole solutions, and find that only three independent combinations are phy…
Primordial scalar power spectrum from the hybrid approach in loop cosmologies
Bao-Fei Li, Javier Olmedo, Parampreet Singh +1
We compare the primordial scalar power spectra in the loop cosmological models using the effective dynamics of the hybrid approach to cosmological perturbations in which the backgr…
Observational tests of the self-dual spacetime in loop quantum gravity
Tao Zhu, Anzhong Wang
The self-dual spacetime was derived from the mini-superspace approach, based on the polymerization quantization procedure in loop quantum gravity (LQG). Its deviation from the Schw…
Information loss paradox revisited: farewell firewall?
Wen-Cong Gan, Fu-Wen Shu
Unitary evolution makes pure state on one Cauchy surface evolve to pure state on another Cauchy surface. Outgoing Hawking radiation is only subsystem on the late Cauchy surface. Th…
Vacua in novel 4D Einstein-Gauss-Bonnet Gravity: pathology and instability?
Fu-Wen Shu
We show an inconsistence of the novel 4D Einstein-Gauss-Bonnet gravity by considering a quantum tunneling process of vacua. Using standard semi-classical techniques, we analyticall…
Spherically symmetric static black holes in Einstein-aether theory
Chao Zhang, Xiang Zhao, Kai Lin +3
In this paper, we systematically study spherically symmetric static spacetimes in the framework of Einstein-aether theory, and pay particular attention to the existence of black ho…
No static regular black holes in Einstein-complex-scalar-Gauss-Bonnet gravity
Kai Lin, Shaojun Zhang, Chao Zhang +3
In this brief report, we investigate the existence of 4-dimensional static spherically symmetric black holes (BHs) in the Einstein-complex-scalar-Gauss-Bonnet (EcsGB) gravity with…
A Non-Geometrodynamic Quantum Yang-Mills Theory of Gravity Based on the Homogeneous Lorentz Group
Ahmad Borzou
In this paper, we present a non-geometrodynamic quantum Yang-Mills theory of gravity based on the homogeneous Lorentz group within the general framework of the Poincare gauge theor…
Shadow and Quasinormal Modes of a Rotating Loop Quantum Black Hole
Cheng Liu, Tao Zhu, Qiang Wu +4
In this paper, we construct an effective rotating loop quantum black hole (LQBH) solution, starting from the spherical symmetric LQBH by applying the Newman-Janis algorithm modifie…
Exploring non-singular black holes in gravitational perturbations
Hang Liu, Chao Zhang, Yungui Gong +2
We calculate gravitational perturbation quasinormal modes (QNMs) of non-singular Bardeen black holes (BHs) and singularity-free BHs in conformal gravity and examine their spectra i…
Gravitational deflection of light and shadow cast by rotating Kalb-Ramond black holes
Rahul Kumar, Sushant G. Ghosh, Anzhong Wang
The nonminimal coupling of the nonzero vacuum expectation value of the self-interacting antisymmetric Kalb-Ramond field with gravity leads to a power-law hairy black hole having a…