Hawking radiation by Schwarzschild-de Sitter black holes: fermionic fields
The problem of low-energy greybody factors for asymptotically non-flat black holes is investigated in the case of Schwarzschild-de Sitter black holes. We focus on the fermionic fields. In our study we are using the analytical methods proposed by Unruh some time ago for determining the greybody factors. We have found that at low energies the greybody factors are constant for a given total angular momentum (similar to what happens in the case of scalar particles reported before in the literature). Also our results are indicating an enhancement in the energy spectrum if one is increasing the value of the cosmological constant.