Interpretation of the triad orientations in loop quantum cosmology
arXiv:1210.0418 · doi:10.1088/0264-9381/30/3/035008
Abstract
Loop quantum cosmology allows for arbitrary superpositions of the triad variable. We show here how these superpositions can become indistinguishable from a classical mixture by the interaction with fermions. We calculate the reduced density matrix for a locally rotationally symmetric Bianchi I model and show that the purity factor for the triads decreases by decoherence. In this way, the universe assumes a definite orientation.
12 pages, 1 figure, additional conceptual and linguistic clarifications
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