An electron beam going at relativistic velocities or lower will transfer energy to any standing wave passes through. What other charges (non-electric) have been observed to that, like gravitational charge, weak force, etc.
The coupling of weak charge to the corresponding gauge fields is Tr(J.A),where J is the corresponding current and A the gauge field, that mediates the weak interactions, in the appropriate representation.
The coupling of matter to the gravitational field is g.T, where g_μν is the metric and T_μν the energy-momentum tensor-which implies that it doesn’t matter what matter is made up of, only its energy-momentum tensor couples to the gravitational field. This is known as the equivalence principle.
All this is now known and isn’t limited to standing waves.
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