An Inconsistency with Everett Interpretation of Quantum Mechanicst

What is it about?

Everett branching of quantum worlds is rejected on the basis of structural variations for a model universe (closed quantum system). This is a simple consequence of the so-called Entanglement Relativity for the standard quantum Brownian motion model as a model of Universe. This instance of inapplicability of Everett's theory challenges its other applications and merits.

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Why is it important?

Quantum Brownian motion is arguably the most elaborated model of a realistic many-particle system's decoherence. Decoherence for at least two structures of the Brownian-motion-model universe excludes Everett branching for both original Everett's scenario as well as for modern 'emergent-decoherence' scenarios. The remaining issues in order to save the Everett idea: the existence of the fundamental Universe structure or that quantum decoherence is not sufficient for semi-classicality.