Interference phase of mass neutrino in Reissner–Nordström–de Sitter space–time

In Reissner–Nordström–de Sitter space–time, we calculate the interference phase of mass neutrino along geodesic in the radial direction, and then investigate the effects of the cosmological constant La on the phase. Morever, the expression of the interference phase can be reduced to that in Reissner–Nordström space–time when Λ approaches to zero.