As, it is known having more challenged on the wave or particle nature of light, from the theory of Newton to proof of its being wave by Huygens and also Young’s Double-slit experiment, more important ,Maxwell equations, all showed the nature of being wave of the light till Heinrich Hertz discovered photoelectric phenomenon and after that Einstein talked about the mathematic and quantum characteristics of this phenomenon, his explanations about this phenomenon showed failure of the characteristic of being wave of light in photoelectric explanation so double wave- particle characteristic failed in the scientific society. We all know that many of mass and energy fundamental systems have the same double characteristic of the light. The Photoelectric is the action of light and matter interactions that can prove the double light- particle nature because of inability of being wave principals of the light. Another one of the nature fundamental forces which many believed on its double wave- particle nature is gravity. In this essay we try to interpret the inability of wave nature of gravity in explanation of dark matter and we will see how the concept of invisible masses of the matter is the only action of the graviton interaction and proof of existence of constituent packs of gravity energy i.e. gravitons. Discovering this innovation is wonderful.
On hypoellipticity for a certain operator with double characteristic