Wang Yong-Jiu

Interference Phase of Mass Neutrinos in Kerr Space-Time*

Along the geodesic we calculate the interference phase of the mass neutrinos in some special cases. Because of the rotation of the mass resource which induces the gravitational field, the angular momentum per unit mass, a, has a contribution to the phase, which is different from the case in Schwarzschild space-time.

The Motion of a Gyroscope Freely Falling Along the Radial Geodesic in the Space-Time of a Black Hole with a Global Monopole

By means of the orthonormal frame, the motion of the axis of a gyroscope freely falling along the radial geodesic in the space-time of a black hole with a global monopole is investigated. It is shown that the axis of the gyroscope rotates about the radial direction as it falls into the black hole.

Gravitational Field of a Rotating, Arbitrarily Accelerating Mass

A new metric depending on five arbitrary parameters is obtained by the method of complex coordinate transformations. It gives the gravitational field of a mass source with both arbitrary acceleration and rotation.

Absorption/Scattering of Massless Dirac Wave from Black Hole Spacetimes with Cosmic String

In this paper we investigate the scattering of massless Dirac wave from several different black hole spacetimes (i.e. the Schwarzschild black hole, the RN extremal black hole, the Schwarzschild de Sitter black hole, and the extremal Schwarzschild de Sitter black hole) which are influenced by the cosmic string, respectively. All these cases show us that the total absorption cross sections oscillate around the geometric-optical limit and decrease with linear mass density μ of the cosmic string. All of the total scattering cross sections exhibit that the main scattering angle becomes narrower for the high partial frequency wave. Due to the influence of cosmic string, the glory peak becomes wider for larger values of linear mass density μ of the cosmic string.

Absorption cross section of black holes with global monopole

We study the absorption problem for a massless scalar field propagating in general static spherically-symmetric black holes with a global monopole. The absorption cross section expression is provided using a partial-wave method, which permits us to make an elegant and powerful resummation of the absorption cross section, and to extract the physical information encoded in the sum over the partial-wave contributions.

A New Solution of Einstein-Maxwell Equations

A new generation theorem for Einstein-Maxwell field is attained. According to it, a new solution of Einstein-Maxwell equations can be generated from a static vacuum solution. Starting with Schwarzschild solution, a new solution of the Einstein-Maxwell equations is obtained by means of this theorem.

Back Reaction of Evaporating Black Holes Attached to Global Monopoles

The back reaction of evaporating black holes with internal global monopoles is studied by examining the Klein-Gordon equation near the event horizon and computing the renormalized expectation value of the stress-energy tensor for conformally invariant massless scalar fields in two dimensions. The effective radiation temperature up to O() is found.

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.

Time-Like Geodesic Motion in Schwarzschild Spacetime with Weak-Field Limit

We analyze the geodesic motion in Schwarzschild spacetime with the weak-field limit. We investigate all geodesic types of the test particle by solving the geodesic equation and analyzing the behavior of effective potential. At the same time, all kinds of orbits, which are allowed according to the energy level corresponding to the effective potential, are numerically simulated in detail. Then we discuss the effect of different parameters on the effective potential energy. We also find that the test particle falls rapidly along the fall-into orbit and the radius of stable (unstable) circular orbits become larger in the Schwarzschild spacetime with the weak-field limit than those in the Schwarzschild case.

Scattering of Scalar Wave by Extended Black Hole in f ( R ) Gravity

We analyze the Schrodinger-type scalar wave equation of an extended black hole in f(R) gravity, and numerically investigate its absorption/scattering cross sections using the partial wave method. It is found that the dimension of length α makes the peak value of the effective scattering potential fall down, and the absorption cross section oscillates around the geometric optical value in the high frequency regime. We can also see that the scattering flux becomes stronger and its angle width becomes narrower in the forward direction, the glory peak becomes lower and the glory width becomes narrower along the backward direction when the coupling parameter α increases.