Parallel occurrence of decoherence

What is it about?

Quantum decoherence is recognized as the main candidate for answering the foundational question of the emergence of the classical world from quantum substrate. Interestingly enough, decoherence can unfold simultaneously for a pair of structures (decompositions into subsystems) of an isolated quantum system. Considered is a pair of mutually irreducible global structures for the arguably 'most macroscopic' model known to date--the Brownian motion model.

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Why is it important?

In contrast to the standard wisdom that decoherence provides "appearance of a classical world in quantum theory", it is established that parallel (simultaneous) decoherence provides appearance of the classical worlds for the one and the same quantum Universe. The structures of interest are mutually irreducible--consisting of mutually irreducible 'elementary particles'. Hence the unique Universe hosts more than one 'classical world' that simultaneously coexist as dynamical worlds--the 'universes'