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By-now photons are the unique universal messengers. Cosmological sources likefar-away galaxies or quasars are well-known light-emitters. Here we demonstratethat the nonlinear electrodynamics (NLED) description of photon propagationthrough the weak background intergalactic magnetic fields modifies in afundamental way the cosmological redshift that a direct computation within aspecific cosmological model can abscribe to a distant source. Independently ofthe class of NLED Lagrangian, the effective redshift turns out to be $1 +\tilde{z} = (1 + z) \Delta$, where $\Delta \equiv (1 + \Phi_e)/(1 + \Phi_o)$,with $\Phi \equiv {8}/{3} ({L_{FF}}/{L_F}) B^2$, being $L_F = {dL}/{dF}$,$L_{FF} = {d^2L}/{dF^2}$, the field $F\equiv F_{\alpha \beta} F^{\alpha\beta}$, and $B$ the magnetic field strength. Thus the effective redshift isalways much higher then the standard redshift, but recovers such limit when theNLED correction $\Delta(\Phi_e, \Phi_o) \longrightarrow 1$. This result mayprovide a physical foundation for the current observation-inspiredinterpretation that the universe undergoes an accelerate expansion. However,under the situation analyzed here, for any NLED the actual (spatial) positionof the light-emitting far-away source remains untouched.

Cosmological redshift and nonlinear electrodynamics propagation of photons from distant sources