Cosmological redshift and nonlinear electrodynamics propagation of photons from distant sources

Abstract

By-now photons are the unique universal messengers. Cosmological sources like far-away galaxies or quasars are well-known light-emitters. Here we demonstrate that the nonlinear electrodynamics (NLED) description of photon propagation through the weak background intergalactic magnetic fields modifies in a fundamental way the cosmological redshift that a direct computation within a specific cosmological model can abscribe to a distant source. Independently of the 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 $L_F=dL/dF$, $L_{FF}=d^{2}L/d{F}^2$, the field $F\equiv F_{\alpha \beta }{F}^{\alpha \beta }$, and $B$ the magnetic field strength. Thus the effective redshift is always much higher then the standard redshift, but recovers such limit when the NLED correction $\Delta ({\Phi }_e,{\Phi }_o)⟶1$. This result may provide a physical foundation for the current observation-inspired interpretation that the universe undergoes an accelerate expansion. However, under the situation analyzed here, for any NLED the actual (spatial) position of the light-emitting far-away source remains untouched.

5 pages, 3 figures, revtex4.sty

References in corpus (1)

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