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We are talking about what existed "before" (quoted because we have no correct word to accurately describe the relationship) spacetime itself. A brane is not an object made of matter like everything around you. It is an extradimensional construct with characteristics totally unlike what you see in classical physics.
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So it could in fact be a wind-up universe generator, or an extra-dimensional goblin or two jube-jubes rubbed just the right way. It could be anything other than nothing. So the problem still remains, something came from nothing...