Dynamical axion

We introduce a new non-Abelian force axicolor which confines between ${10}^{10}$ and ${10}^{12}$ GeV. By choosing appropriate axiquarks, we build a realistic dynamical axion model. This model predicts a heavy quark q. The dynamical axion model does not involve the naturalness problem of scalar mass. Two well-known cosmological problems, the domain-wall problem and the energy density problem of heavy composite particles, are not present in this model. We also discuss domain walls with two θ’s.