One expert said the magnetic moment of an electron is due to rotating charge. Since charge has energy is has mass (e=m c c). The means there is centrifugal field between that charge and any mass near by that not move parallel to its motion. Therefore, centrifugal force is a nuclear force inside subatomic particles. Since it is between masses ( centered at the center of gravity), is proportional to mass, is a repulsive force, the decreases with distance it has most of the properties negative gravity should have. But it does not decrease with square of distance; it decreases with distance. F=m v v/r . There is no reason not to have negative gravity inversely proportional to distance not the square of distance. Unless of cause, anti-matter is observed to negative gravity decreasing with square of distance. Even if it is separate force it like positive gravity is proportional to mass, like the idea of negative gravity it is repulsive and decreases with distance.