Can I assume that anything with high enough speed will generate electromagnetic wave? Photons are not charged. But maybe because they move fast enough, they generate vortex electric field, since this field is changing, then you have a corresponding magnetic field with it, so you have an electromagnetic wave. So, if the speed of the particle is fast enough, you can generate electric field without the particle being charged? So, can I say that a photon is simply a very small particle moving very fast, and generating electromagnetic wave? Or ,maybe photons are particles of vacuum?