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From the time of CMB decoupling onwards we investigate cosmological evolutionsubject to a strongly interacting SU(2) gauge theory of Yang-Mills scale$\Lambda\sim 10^{-4}$ eV (masquerading as the $U(1)_{Y}$ factor of the SM atpresent). The viability of this postulate is discussed in view of cosmologicaland (astro)particle physics bounds. The gauge theory is coupled to a spatiallyhomogeneous and ultra-light (Planck-scale) axion field. As first pointed out byFrieman et al., such an axion is a viable candidate for quintessence, i.e.dynamical dark energy, being associated with today's cosmological acceleration.A prediction of an upper limit $\Delta t_{m_\gamma=0}$ for the duration of theepoch stretching from the present to the point where the photon starts to beMeissner massive is obtained: $\Delta t_{m_\gamma=0}\sim 2.2$ billion years.Comment: v3: consequences of an error in evolution equation for coupling  rectified, only a minimal change in physics results, two refs. adde

A Planck-scale axion and SU(2) Yang–Mills dynamics: present acceleration and the fate of the photon