let's see, photon has no mass no charge, yet it carries em fields and energy? electrons can relax? can emit photons? red and blue photons? is red photon vibrating 4 x 10^14 times per second? or is red photon passing a point 4 x 10^14 times per second? exited atoms do vibrate and produce gravitation waves, it is fact. is gravitation radiation propagating at c speed? is it has frequency? is its energy inversely proportional to r^2? your call, open your mind.