BMS particles
Xavier Bekaert, Laura Donnay, Yannick Herfray
TL;DR
This paper constructs wavefunctions for BMS group representations, revealing that BMS particles are quantum superpositions of Poincaré particles on different gravity vacua, based on a new classification of supermomenta.
Contribution
It introduces a novel wavefunction construction for BMS particles and redefines their classification via a Lorentz-invariant supermomentum decomposition.
Findings
BMS particles are superpositions of Poincaré particles.
A new classification of BMS group UIRs is proposed.
The approach links BMS symmetries to quantum superpositions in gravity.
Abstract
We construct wavefunctions for unitary irreducible representations (UIRs) of the Bondi-Metzner-Sachs (BMS) group, i.e. BMS particles, and show that they describe quantum superpositions of (Poincar\'e) particles propagating on inequivalent gravity vacua. This follows from reconsidering McCarthy's classification of BMS group UIRs through a unique, Lorentz-invariant but non-linear, decomposition of supermomenta into hard and soft pieces.
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