Quasinormal Modes of Spherical Symmetrical Black Hole with x-Matter

In this paper, we use expansion method with eikonal limit to calculate the scalar and Dirac quasinormal modes of black hole with x-matter, which is a spherical symmetrical vacuum black hole in a brane-world scenario. The spacetime includes x-matter as the dark energy. From the results, we find the x-matter accelerates quasinormal frequency and slows damping rate of amplitude.