I have been struggling to figure out what, exactly, the relationship between energy and matter is. What I struggle to understand is the connection at the subatomic level. I am not well-versed in quantum mechanics, so when I try to read up on it I get lost in jargon and concepts. Any chance any of you could explain it?
My current understanding would be that the particles that make up electrons, neutrons, and protons, are composed of 'point' particles whose resulting compositions are governed by the interactions of the 4 fundamental forces. I fail to see, however, how exactly something has mass at a macro level, but none at a particle level. ( if that isn't a fallacious statement)
Also, in string theory, is it posited that a certain vibration would lend credence to mass?