Bacciagaluppi, Guido (2025) The Relativity of Branching. [Preprint]

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Abstract

I argue that different ways that branching fits within Minkowski spacetime are merely different descriptions of an invariant notion of branching and are due to the relativity of simultaneity. The argument fits in the wider framework of Everett branches as real patterns, and is both developed in the abstract setting of the (generalised) histories formalism, and discussed comparing the concrete examples of hypersurface-dependent branching and of branching along the forward lightcone. I formulate the latter in terms of branching spacetime, suggesting this is a way in which spacetime can emerge from the universal wavefunction, and I make tentative connections with causal set theory. The proposed view is compatible with both the Schroedinger and Heisenberg picture. [To appear in A. Ney (ed.), Locality and the Many Worlds Interpretation of Quantum Mechanics (Oxford: Oxford University Press).]

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Item Type:	Preprint
Creators:	Creators Email ORCID Bacciagaluppi, Guido g.bacciagaluppi@uu.nl
Keywords:	quantum mechanics, Everett, branching, relativity
Subjects:	Specific Sciences > Physics > Quantum Mechanics Specific Sciences > Physics > Relativity Theory
Depositing User:	Guido Bacciagaluppi
Date Deposited:	15 Apr 2025 13:31
Last Modified:	15 Apr 2025 13:31
Item ID:	25071
Subjects:	Specific Sciences > Physics > Quantum Mechanics Specific Sciences > Physics > Relativity Theory
Date:	15 April 2025
URI:	https://philsci-archive.pitt.edu/id/eprint/25071

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