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It has recently been reported that certain thin timelike shells undergooscillatory motion in AdS. In this paper, we compute two-point function of aprobe field in the geodesic approximation in such an oscillating shellbackground. We confirm that the two-point function exhibits an oscillatorybehaviour following the motion of the shell. We show that similar oscillatorydynamics is possible when the perfect fluid on the shell has a polytropicequation of state. Moreover, we show that certain ball like configurations inAdS also exhibit oscillatory motion and comment on how such a solution can besmoothly matched to an appropriate exterior solution. We also demonstrate thatthe weak energy condition is satisfied for these oscillatory configurations.

Oscillating Shells and Oscillating Balls in AdS