"The hypothesis underlying all approaches to the landscape is that there is a cosmological setting in which different regions or epochs of the universe can have different effective laws. This implies the existence of spacetime regions not directly observable... These regions must either be in the past of our big bang, or far enough away from us to be causally unrelated."
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Lee Smolin, "A perspective on the landscape problem" arXiv (Feb 15, 2012).
https://en.wikiquote.org/wiki/Spacetime
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Spacetime
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