Free electron Electrons 2 Cosmology: theory 1 Dispersion measure 1 Dispersion relations 1 Dispersions 1 Drift velocities 1 Electric fields 1 Electric space charge 1 Electromagnetic waves 1 Electron scattering 1 Electron sheets 1 Electron wave functions 1 Equivalence classes 1 Equivalence principles 1 Field theory 1 Gold nanoparticle 1 Gold nanoparticles 1 Interference signal 1 Interferometric imaging 1 Interferometry 1 Large scale structure of universe 1 Line of Sight 1 Lines-of-sight 1 Mach Zehnder interferometry 1 Mach-Zehnder interferometers 1 Photons 1 Polarizabilities 1 Quantum theory 1 Radio bursts 1