The best theory I have seen of how it works can be found here: https://arxiv.org/abs/1604.03449
Makes for interesting reading. As far as I can tell the theory of operation implies that the universe is not a closed system, neatly sidestepping the First Law of Thermodynamics.
A criticism of the idea can be found here: https://arxiv.org/abs/1506.00494
It will be interesting to see how this plays out.
Biting the hand that feeds IT
