Speaker
Description
We show that inflationary magnetogenesis can occur without modifying the microscopic Maxwell action. The observable photon sector inside a de Sitter causal patch is treated as a reduced subsystem that relaxes at a finite rate toward a horizon-selected quasi-static branch. Because the physical photon frequency continuously redshifts during inflation, this reduced dynamics cannot track the branch exactly and generates a non-adiabatic squeezing of the photon state. The resulting excitation freezes after horizon exit, leaving a magnetic relic that survives reheating as a primordial seed field. For a phenomenologically interesting range of relaxation parameters, the magnetic spectrum is approximately scale invariant to mildly blue, while the associated electromagnetic energy density remains parametrically below the inflationary background. This identifies horizon-induced reduced- state dynamics as a distinct route to primordial magnetogenesis that bypasses explicit conformal- symmetry breaking in the Maxwell sector.
