if we are talking about gravity here is something to think about..
Gravity is essentially negative energy. The rough sum of the total gravitational negative energy matches the rough sum of the positive energy contained in the visible universe. The basically means we live in a zero-sum existence. The mechanism that caused what most refer to as 'the big bang' is what slit the zero into -1 and +1 parts. Entropy that resulted will not fade for a good long time, but in time, as all things, it will slowly collect back to an original state of 0. Now if you can understand this, its a little mind blowing to imagine the ultimate tool; that mechanism that splits nothing into its two parts. What the fuck is it? How the fuck did it come to be? What is the catalyst?
Even if our reality is a simulation, these things would hold true into the "higher plain", and the question would remain for the "real" world as well; what the fuck is splitting nothing, and possibly they too could be a simulation, and this could go on into infinity like zooming into a fractal image. These 'splits' are likely happening infinity as well. A countless number of universes coming and going like bubbles in a boiling pot that we cannot ever hope to see, as light speed acts as an ever closing veil, losing to the speed of spaces expansion. You think Earth is so tiny compared to the sun, and the sun compared to the galaxy and the galaxy to the universe? Our universe exists like a grain of sand on a desert larger than the sun
Here is a nice fictional story that touches a bit on 'the mechanism' as I put it :
http://filer.case.edu/dts8/thelastq.htm