Abstract:
A method of obtaining electromagnetic field tensor for the source of the field possessing both electric and magnetic charges is given. As an example, in Kerr-Newman space-time with a large number of magnetic charges the method is used, and the results are the same as those obtained by making electric charge a complex extension directly to e+iq.

Abstract:
This paper gives a conformally flat interior solution of Einstein Maxwell equations for a stationary spherically symmetric distribution of sphere possessing both electric and magnetic charges. The solution is physically reasonable.

Abstract:
By using the thin film model,which is based on the brick-wall method,the entropy of the Dirac field in a general spherically symmetric and charged evaporating black hole is calculated.The conclusion that black hole entropy is proportional to its horizon area can still be applied by regulating the cutoff,which is time dependent.

Abstract:
The event horizon equation is given.Using Damour_Ruffini method improved by Zhao Zheng, the formula of temperature is obtained, which supports the result by Zhao Z (Acta Phys. Sin. 1990 39 1845) (in Chinese).

Abstract:
Since Parikh and Wilczek's tunneling method was proposed, there have been many generalizations, such as its application to massive charged particles' tunneling and other spacetimes. Moreover, a variant tunneling method was also recently proposed by Angheben et al that it was independent of coordinates. However, there are some subtleties in the calculation of Hawking radiation, and particularly is the so-called factor of 2 problem during calculating the Hawking temperature. The most popular opinion on this problem is that it is just a problem of the choice of coordinates. However, following other treatments we show that we can also consider this problem as a problem that we do not consider the contribution from P(absorption). Moreover, we also give some subtleties in the balance method and some comparisons with other treatments. In addition, as Parikh and Wilczek's original works have showed that if one takes the tunneling particles' back-reaction into account, the Hawking radiation would be modified, and this modification is underlying consistent with the unitary theory, we further find that this modification is also underlying correlated with the laws of black hole thermodynamics. Furthermore, we show that this tunneling method may be valid just when the tunneling process is reversible.

Abstract:
In this paper the tunneling framework is adopted to investigate the Hawking radiation. The emission rate which massive particles tunnel across the event horizon of the Schwarzschild black hole is calculated. It is consistent with an underlying unitary theory and takes the same functional form as that of massless particles.

Abstract:
The Hawking radiation of Dirac particles on event horizon of nonuniformly rectilinearly accelerating black hole with electric and magnetic charge is studied in this paper. First, we construct the symmetrized null tetrad from which the spin coefficients and Dirac equation are derived. Next, by proposing a generalized tortoise coordinate transformation, the Dirac equation is decoupled successfully near the event horizon surface. Finally, following the method of Damour and Ruffini, the temperature on the horizon surface and the thermal spectrum formula of Dirac particles are obtained. The result is also discussed.

Abstract:
We extend Parikh＇s study to the non-stationary black hole. As an example of the non-stationary black hole, we investigate the tunnelling effect and Hawking radiation from a Vaidya black hole whose Bondi mass is identical to its mass parameter. The Hawking radiation is considered as a tunnelling process across the event horizon and we calculate the tunnelling probability. It is found that the is the function of Bondi mass re（υ）. result is different from Parikh＇s study because dr H/dυ