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Published online 8 October 2004 | Nature | doi:10.1038/news041004-17
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How to build the Universe
Including cause-and-effect in equations produces 4-dimensional space-time.
Is causality an inherent and necessary characteristic of the Universe, or just an illusion produced by the way our brains interpret the world?
It's real, say physicists, who believe they have worked out how the Universe is constructed from the tiniest building-blocks of space-time. The finding could also help the development of a theory of quantum gravity, which would marry the two currently estranged physical theories of the Universe: quantum theory and relativity.
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