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I was outside mowing my lawn the other day, thinking about the universe, nature, etc., when I asked the question: "What force is causing the expansion of the universe?"...(and I would like very much for someone like Russell E. Rierson to review this) I thought about the 4 fundamental forces and how none seemed to fit on a scale that large. I thought of some sort of "momentum", but that made no sense...something is driving this expansion because it is overtaking the total gravity of mass and dark matter in the universe. I know, very basic to many here...

Yet still, nothing about the known forces fit. I thought of another force, possibly an "anti-gravity"; *yet not totally related to known gravity because of the scale involved*...as possibly another fundamental force; I began to think of it in terms of string theory and how this "new force" might be broke down into those tiny dimensions, relating it to and possibly being the unifier of the other 4 forces...this "new force" would be even weaker than gravity and 2 of it's functions being driving the expansion and uniting the 4 known forces. (I will explain why it would unite the other 4 forces if asked, way too much to write here...I'm hoping someone can see what I'm talking about just by thinking about this and help with the math).

Please someone show me what is known about this (with the math) and forgive my obvious "laymanness". Brian Harred