Electromagnetism is nothing but continuum pressure physics. There exists a photonic aether that has certain pressure. Electrons cause hyper pressure near them, thus the force. Protons, on the other hand, are places where there is a lower pressure than this basic pressure of aether is. Thus they form a vacuum suction effect that seems to be and opposite sign effect, but is not really.

The mathematical sign play is a fiasco and childish. There is no negative numbers in nature.

Also, universe expands due the fact there is nothing to hold this pressure, thus it must expand.