  We present the holographic construction of the dark bubble model of dark
energy and highlight the pivotal role played by the non-normalizable modes.
Following the route of holographic renormalization, we show that the
non-normalizable modes are essential for having a vanishing mass for the
induced graviton in any braneworld model. We then apply this idea in the
computation of the propagator on the wall of the dark bubble introduced in
1807.01570.
