Open strings on D-branes from ABJM

We study open strings on giant gravitons (D-branes on cycles) in the ABJM/$Ad{S}_4\times {\mathbb{C}\mathbb{P}}^3$ correspondence. We find that their energy spectrum has the same form as the one for closed strings, with a nontrivial function of the coupling, avoiding BMN scaling. A similar, Cuntz oscillator, Hamiltonian description for the string (operators at strong coupling) to the $Ad{S}_5$ case is valid also in this case.