Hall effects in Carroll dynamics

HAL (Le Centre pour la Communication Scientifique Directe)(2023)

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摘要
``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 the Carroll boost symmetry (alias dipole symmetry of fractons). A strictly massless Carroll particle may propagate by following the Hall law consistently with the partial breaking of the Carroll boost symmetry. In $d=2$ 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 anomalous Hall law which includes a Zeeman force. Our 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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hall effects,carroll dynamics
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