  Central heavy-ion collisions may induce sizeable fluctuations of the
topological charge. This effect is expected to distort the dispersion relation
for the hadron masses. We construct a general setup for a compact description
of this phenomenon in the framework of bottom-up holographic approach to QCD. A
couple of soft wall holographic models are proposed for the vector mesons. The
states having different circular polarizations are shown to have different
effective mass. The requirement of stability imposes strong constraints on the
possible choice of models.
