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Interaction / collision of two concentric spherical thin-shells of linearfluid resulting in collapse has been considered recently. We show that additionof finely tuned electric charges on the shells apart from the cosmologicalconstant serves to delay the collapse indefinitely, yielding an ever collidingsystem of two concentric fluid shells. Given the finely tuned charges thisprovides an example of a perpetual two-body motion in general relativity.

Repeated crossing of two concentric spherical thin-shells with charge