Submissions (by speaker) > Spallicci Alessandro

We investigate possible evidence from Extended Theories of Electro-Magnetism (ETEM) by looking for deviations from the Ampère-Maxwell law. The photon, main messenger for interpreting the universe, is the only free massless particle in the Standard-Model (SM). Indeed, the deviations may be due to a photon mass for the de Broglie-Proca (dBP) theory or the Lorentz Symmetry Violation (LSV) in the SM Extension (SME), but also to non-linearities from theories as of Born-Infeld, Heisenberg-Euler. With this aim, we have analysed six years of data of the Magnetospheric Multi-Scale mission, which is a four-satellite constellation, crossing mostly turbulent regions of magnetic reconnection and collecting about 95\% of the downloaded data, outside the solar wind. We examined 3.8 million data points from the solar wind, magnetosheath, and magnetosphere regions. In a minority of cases, for the highest time resolution burst data and optimal tetrahedron configurations drawn by the four spacecraft, deviations have been found (2.2% in modulus and 4.8% in Cartesian components for all regions, but raising up in the solar wind alone to 20.8% in modulus and 29.7% in Cartesian components and up to 45.2% in the extreme low-mass range). The deviations might be due to unaccounted experimental errors or, less likely, to non-Maxwellian contributions, for which we have inferred the related parameters for the dBP and SME cases. Possibly, we are at the boundaries of measurability for non-dedicated missions. We discuss our experimental results (upper limit of photon mass of 2.1 x 10^{-51} kg, and of the LSV parameter k^{AF} of 6 x 10^{-9} m^{-1}), and the deviations in the solar wind, versus more stringent but model-dependent limits. For plasma physicists, the interest lies in our detailed error analysis. We look for experts to complete the work on calibration analysis.