when I read string theory and dimensions I think back of a report I did in philosophy about cymatics. see everything has an origin point and out of that point waves emit as vibration, this vibration because of oscillation and frequency and other factors creates a pulling and pushing force. so picture a orb of sound waves emitting so far away from it center to pull back into its center as well. so where does the vibration come from? the inner dimension of that center point. so I would think we are in the outer sphere of one dimension with layered spheres in the center like a tree trunk. the forces originate from that center dimension and emit or are filtered through to our dimension. in programming its called inheritance and our dimension is inherited and added to from the parent deminsions within our reality. as for a mathematical formula..... well you got me there, I'm no physics teacher or I'd write one down.haha