Gao, Shan
(2024)
Understanding Branching in the Many-worlds Interpretation of Quantum Mechanics.
[Preprint]
Abstract
It has been recently debated whether world branching in the many-worlds interpretation of quantum mechanics (MWI) is global or local. In this paper, I present a new analysis of the branching process in MWI. First, I argue that branching is not global. Next, I argue that branching is not necessarily local either, and it can be nonlocal for particles being in an entangled state. Third, I argue that for nonlocal branching there is action at a distance in each branching world, and as a result, there is also a preferred Lorentz frame in the world. However, the action at a distance in each world is apparent in the sense that there is no action at a distance and resulting preferred Lorentz frame in the whole worlds, and thus MWI is consistent with special relativity.
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