According to the Poincare recurrence theorem - certain systems will, after a sufficiently long but finite time, return to a state very close to the initial state. and according to wikipedia - a quantum fluctuation or vacuum fluctuation is the temporary change in the amount of energy in a point in space,as explained in Werner Heisenberg's uncertainty principle. and according to wikipedia again - a bubble of lower-energy vacuum could come to exist by chance or otherwise in our universe, and catalyze the conversion of our universe to a lower energy state in a volume expanding at nearly the speed of light, destroying all that we know without forewarning. Chaotic Inflation theory suggests that the universe may be in either a false vacuum or a true vacuum state. Is it possible that in a universe such as ours that expands forever and reaches heat death will have regions where all these occurrences happen at the same time; thereby birthing a new stable universe that is part of, yet separate from our own.