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The QCD axion bubbles can be formed due to an extra Peccei-Quinn (PQ)symmetry breaking in the early Universe. In this paper, we investigate the QCDaxion bubbles formation from the PQ symmetry broken by hidden $SU(N)_H$ gaugeinteractions after inflation, which leads to the multiple vacua. The axionacquires a light mass and then settles down into different vacua. The QCD axionbubbles are formed when the conventional QCD axion arises during the QCD phasetransition. In our scenario, the QCD axions that start to oscillate at thelarge values $\sim2\pi/3$ can lead to the high density axion bubbles with$N=2$. The cosmological implications of the QCD axion bubbles are alsodiscussed, such as the primordial black holes (PBHs) and the axionminiclusters. We find that the PBH mass is lager than$\sim\mathcal{O}(5\times10^5)M_\odot$ for the axion scale$f_a\sim\mathcal{O}(10^{16})\, \rm GeV$.

QCD axion bubbles from the hidden SU(N) gauge symmetry breaking