  The AdS soliton is a nonsingular spacetime that has a flat conformal boundary
with a compact $S^1$ direction. We find a horizonless cohomogeneity-1 metric
that describes nonlinear gravitational oscillations of the AdS soliton in five
dimensions. We call this spacetime the resonating AdS soliton. This solution is
obtained as the nonlinear extension of normal modes of the AdS soliton dual to
spin-2 glueball excitations. The boundary energy momentum tensor of the
resonating AdS soliton has time periodic components, and it is interpreted as a
coherently excited state in the dual field theory. Physical quantities of the
resonating AdS soliton are multivalued at a fixed energy, suggesting a
transition between different frequency solutions. The energy of the resonating
AdS soliton is higher than that of the undeformed AdS soliton, in accordance
with the positive energy conjecture proposed by Horowitz and Myers.
