Shen You-Gen

Fermion entropy of Vaidya-Bonner black hole

Using the membrane model which is based on the brick-wall model, we have calculated the free energy and entropy of the Vaidya-Bonner black hole due to fermion fields. The result shows that the entropy of the Vaidya-Bonner black hole is exactly proportional to the area of its event horizon. The relationship between the entropy and event horizon in such a non-static case is just the same as that in a static or stationary cases.

De Broglie-Bohm Quantization of the Reissner-Nordstrom Black Hole with a Global Monopole in the Background of de Sitter Space-Time

We present the classical solution of Lagrange equations for the Reissner-Nordstrom black hole with a global monopole in the background of de Sitter space-time. Then we obtain the wavefunction of the space-time by solving the Wheeler-De Witt equation. De Broglie-Bohm interpretation applied to the wavefunction gives the quantum solution of the space-time. Finally, the quantum effect on Hawking radiation is studied.

Generalized uncertainty principle and the quantum entropy of rotating black hole

The entropy of rotating Kerr–Newman–Kasuya black hole due to massive charged fields (bosons and fermions) is calculated by using the new equation of state density motivated by the generalized uncertainty relation. The result shows the entropy does not depend on the mass and the charge but the parameter λ, the area A and the spin of the fields. Moreover, an improved approximation is provided to calculate the scalar entropy.

Quantum teleportation and Kerr-Newman spacetime

We consider the teleportation in the background of Kerr–Newman spacetime. Because of the Hawking effect, the fidelity of the teleportation is reduced. The results also show the fidelity is closely related to the mass, charge and rotating velocity of the black hole: high fidelity can be reached for massive, slowly rotating Kerr–Newman black holes.

Quantum information measurements for Garfinkle-Horne dilaton black holes

The quantum non-cloning theorem is discussed for Garfinkle-Horne dilaton black holes. It is found that if the black hole complementarity principle is correct, then it will be questioned whether the quantum non-cloning theorem is well established inside the inner horizon. It is also found that another complementarity principle may be needed inside the inner horizon of the Garfinkle-Horne dilaton black hole.

First Quantum Correction to Dirac Entropy for Rotating U(1)⊗U(1) Dilaton Black Hole

The first quantum correction to rotating U(1)⊗U(1) dilaton black hole entropy is calculated by using the improved brick-wall model. We propose not to consider the superradiant mode for the reason that fermion fields do not display superradiance. We found that the nonsuperradiant mode does contribute exactly the first quantum correction to the non-extreme black hole entropy. Moreover, our cut-off Newman-Penrose e which does not require an angular cut-off is independent of angle. As for the extreme black hole, we found that its entropy is zero.

Entropy in the NUT-Kerr-Newman black holes in the background of de Sitter spacetime

We calculate the entropy of the fermion field in the NUT-Kerr-Newman black holes in the background of the de Sitter spacetime by using the improved brick-wall method and the membrane model. Here the Euler characteristic of the black holes is over two. The results show that, as the cut-off is properly chosen, the entropy in the black hole satisfies the Bekenstein-Hawking area law.

Wormholes and the Fermi field

Abstract In this paper, we discuss the wormhole model with the coupled Fermi field, deduce the corresponding equations and give an analytical solution of them.

Note on the Constraint on Modified Energy--Momentum Relation

Quantum gravity can modify the usual energy-momentum dispersion relation. We provide evidence for the argument that the modified dispersion relation is constrained by the black hole thermodynamics, for consistency of quantum gravity.

Extra dimensions and vacuum dark energy models

The role of vacuum energy or cosmological constant in cosmology is discussed in a kind of nontrivial higher-dimensional model. Under the framework of Einsteins gravity, we obtain the corresponding equations of motion and find that the cosmological constant and vacuum energy in the full regime does not drive its acceleration, but decelerates the expansion of the universe. The dimension of space is required to be n = 3 if we regard vacuum energy or cosmological constant as the candidate to drive the accelerated expansion of the universe.