I want to get some opinions on what the source of dark energy is? I think there are basically two camps here. One camp says that dark energy originates from space itself, it is some perturbation in the quantum field whereby one cubic meter of space becomes 10 cubic meters somehow, and so on. The other camp would see it as the universe being "filled" by something external to it, like someone blowing air in a balloon. The end effect of both scenarios would be essentially the same, a sphere of space-time blowing up and expanding isotropically and homogenously everywhere, but the fundamental sourcing of that expansion would be different. I think the null hypothesis here is that the universe is being filled with something external to itself. One potential candidate is that our universe is being filled with space-time-matter-energy from the remnants of a black hole in another universe. This is the postulate put forth by Lee Smolin and his crew at the perimiter institute. But what are the arguments against this theory and what are the arguments for space itself expanding, which seems to me counterintuitive.