In a multi-fold universe, gravity emerges from entanglement and spacetime is discrete, with a fractal structure based on random walk and a non-commutative geometry. When random walk is combined with maximal particle generations, exponential expansion can automatically takes place. Away from maximal generation or in an already concretized spacetime, random walk accounts for a constant or slowing down expansion. Meanwhile, the multi-fold mechanisms also implies a constant expansion potential, adding a force to the expansion of the universe, thanks to uncertainties. It explain the constant acceleration of the universe expansion with a cosmological constant that is not the vacuum energy density but can be way smaller. It may contribute to addressing problems like the absence of any explanation of dark energy, the embarrassing orders of magnitude of discrepancies between vacuum energy and the cosmological constant predicted by conventional Physics; issues that are among Today’s biggest mysteries of the universe. These explanations do not require New Physics beyond the Standard Model and the Standard Cosmology Model.