Scattering of dirac waves off Schwarzschild-de Sitter black hole

The radial parts of Dirac equation between the inner and the outer horizon in the Schwarzschild-de Sitter geometry are solved. Two are the limiting cases we concentrate upon. The first case is when the two horizons are far apart and the second case is when the horizons are close to each other. In each case, the solutions of the wave equations as well as the reflection and transmission coefficients are computed. Furthermore, the influences of different cosmological constants on the nature of the reflection and transmission coefficients and wave functions are shown.