English

Hall effects in Carroll dynamics

High Energy Physics - Theory 2025-05-20 v4 Other Condensed Matter General Relativity and Quantum Cosmology

Abstract

``Do Carroll particles move?'' The answer depends on the characteristics of the particle such as its mass, spin, electric charge, and magnetic moment. A massive Carroll particle (closely related to fractons) does not move; its immobility follows from Carroll boost symmetry which implies dipole conservation, but not conversely. A massless Carroll particle may propagate by following the Hall law, consistently with the partial breaking of the Carroll boost symmetry. The framework is extended to Carroll field theory. In d=2d=2 space dimensions, the Carroll group has a two-fold central extension which allows us to generalize the dynamics to massive and massless particles, including anyons. The anyonic spin and magnetic moment combine with the doubly-extended structure parameterized by two Casimir invariants interpreted as intrinsic magnetization and non-commutativity parameter. The extended Carroll particle subjected to an electromagnetic background field moves following a generalized Hall law which includes a Zeeman force. This theory is illustrated by massless, uncharged anyons with doubly-centrally extended structure we call exotic photons, which move on the horizon of a Black Hole, giving rise to an anyonic spin-Hall Effect.

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Cite

@article{arxiv.2212.02360,
  title  = {Hall effects in Carroll dynamics},
  author = {L. Marsot and P. -M. Zhang and M. Chernodub and P. A. Horvathy},
  journal= {arXiv preprint arXiv:2212.02360},
  year   = {2025}
}

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affiliation updated

R2 v1 2026-06-28T07:22:34.281Z