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We propose a cosmological scenario in which the hot big bang universe is produced by the collision of a brane in the bulk space with a bounding orbifold plane
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Where did this "brane" come from?
That's the problem with both the religious and the scientific approach. Whether it is a deity, a brane, a cosmic soup, a wind-up universe generator or naughty pixies, the problem is the same: can't get something out of nothing.