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We have studied the quasinormal modes and the late-time tail behaviors ofscalar, electromagnetic and gravitational perturbations in the Schwarzschildblack hole pierced by a cosmic string. Although the metric is locally identicalto that of the Schwarzschild black hole so that the presence of the string willnot imprint in the motion of test particles, we found that quasinormal modesand the late-time tails can reflect physical signatures of the cosmic string.Compared with the scalar and electromagnetic fields, the gravitationalperturbation decays slower, which could be more interesting to disclose thestring effect in this background.Comment: 17 pages; 7 figure

international journal of modern physics a

QUASINORMAL MODES AND LATE-TIME TAILS IN THE BACKGROUND OF SCHWARZSCHILD BLACK HOLE PIERCED BY A COSMIC STRING: SCALAR, ELECTROMAGNETIC AND GRAVITATIONAL PERTURBATIONS