2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139416Based on quantitative predictions enabled by a nonperturbative approach to Yang-Mills thermodynamics it is explained why the physics of photon {\sl propagation} is not unlikely rooted in pure SU(2) gauge dynamics.8 pages, 4 figures, talk given at QFext07 in LeipzigHigh Energy Physics - Phenomenologytext