http://www.lifeslittlemysteries.com/string-theory-big-bang-2238/
The researchers said the spontaneous symmetry-breaking resulted from a quantum fluctuation — a momentary violation in the law of conservation of energy, which is permitted by the rules of quantum mechanics. "The space-time has certain uncertainties … as dictated by Heisenberg's uncertainty relation. One of our important findings is that this quantum nature of space-time indeed favors three extended spatial directions rather than other cases. How the quantum space-time evolves into a classical one as we perceive now, is an important issue we are planning to address in the near future," Nishimura wrote.
