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We propose a simple toy model to explain the 2:3:6 QPO structure in GRS1915+105 and, more generally, the 2:3 QPO structure in XTE J1550-564, GROJ1655-40, and H 1743-322. The model exploits the onset of subharmonics in thecontext of diskoseismology. We suggest that the observed frequencies may be theconsequence of a resonance between a fundamental g-mode and an unobservablep-wave. The results include the prediction that, as better data becomeavailable, a QPO with a frequency of twice the higher twin frequency and alarge quality factor will be observed in twin peak sources, as it might alreadyhave been observed in the especially active GRS 1915+105.

The 2:3:6 QPO structure in GRS 1915+105 and cubic subharmonics in the context of relativistic diskoseismology