Quantum states and space-time causality

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Space-time symmetries and internal quantum symmetries can be placed on equal footing in a hyperspin geometry. Four-dimensional classical space-time emerges as a result of a decoherence that disentangles the quantum and the space-time degrees of freedom. A map from the quantum space-time to classical space-time that preserves the causality relations of space-time events is necessarily a density matrix.
9 pages, to appear in the Proceedings of the 2nd International Symposium on Information Geometry and its Applications

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