Waves in Bopp–Landé–Thomas–Podolsky generalized electrodynamics

We investigate the feasibility of probing Bopp–Landé–Thomas–Podolsky generalized electrodynamics with traveling and standing wave experiments. We consider wave propagation in vacuum and in a cold and non-magnetized plasma. Dispersion relations are found for all possible transverse and longitudinal modes. Longitudinal traveling waves are found which exhibit negative group velocities. • Plasma presence improves feasibility of observation in modified electrodynamics. • Medium consideration proves advantageous in comparison to vacuum. • Novel longitudinal plasma modes exhibit negative group velocities. • Standing waves provide frequency shifts produced by current constraints.