Non-Maxwellian electromagnetism in astrophysics and cosmology
Inexplicable observations on the Universe prompt cosmologists to propose either ad hoc explanationsas dark matter and energy maintaining general relativity entirely valid, or to propose alternatives togeneral relativity, without evoking dark ingredients . But for the former investigation track,experimental confirmations are missing, and for the latter general relativity continues to predictobservations with exactitude.Confronted with this dichotomy, and with a multi-parametrised cosmology, we consider legitimate alsoto investigate on the nature of the main messenger from the Universe, light, that we stick so far tointerpret as Maxwellian. But the photon in the Standard Model singles out as the only massless freeparticle, and the waves emerge from a linear theory of the XIX century. What if light were to bedescribed by a different theory?Results on testing non-Maxwellian electromagnetism (either massive initiated by de Broglie and Procaor non-linear by Born and Infeld, Heisenberg and Euler) include setting photon mass upper limits fromthe modified Ampère law in solar wind through the Cluster spacecraft , or from frequency dependentgroup velocities of photons from Fast Radio Bursts [2,5]. Future nanosatellite swarms operating in anew radio-astronomy window, 10 KHz - 10 MHz,  might provide a significant contribution.De Broglie formulated a photon mass already in 1922 and in the later year he estimated such mass to belower than 10 -53 kg, surprisingly close to the actual limits established by the Particle Data Group.Meanwhile, an effective photon mass emerges when Lorentz symmetry is broken in (possibly Super-Symmetrised) Standard Model Extensions, as well as bi-refringence and dissipation [3,4].Non-linear effects as polarisation dependent frequency shifts in strong magnetic field in Magnetars havebeen analysed too , but we are now progressing in modelling a general non-linear electromagnetismLagrangian and look whether wave dissipation in vacuum may occur, possibly in presence of abackground field. When wave dissipation is transferred into photon energy description, we cannot avoidconsidering, additional, non-cosmological redshifts.
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About the talk
Université d’Orléans, Observatoire des Sciences de l’Univers en Région Centre,Centre Nationale de la Recherche Scientifique, Laboratoire de Physique et Chimie de l’Environnement et de l’Espace