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Peer-reviewedCC BY 4.0Journal of High Energy Physics

On the integrability of root-Kerr probe dynamics

  • Sungsoo Kim1
  • Sangmin Lee2
  1. 1Seoul National University
  2. 2Korea Institute for Advanced Study
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Abstract

A bstract : In the background of a Kerr-Newman black hole, the motion of a scalar particle is integrable by virtue of an extra conserved charge known as the Carter charge. When the particle is endowed with spin, it is known that another conserved charge, the Rüdiger charge, maintains the integrability at least at low orders in the spin magnitude. We explore the extent of this integrability in a simpler model where both the source and the probe are root-Kerr particles, the non-gravitating limit of the Kerr-Newman black hole. At the leading order in the probe charge, the integrability holds to all orders in the spin magnitude if the interaction vertices of the probe are dictated by the Newman-Janis shift. At the second order in the probe charge, the integrability can be extended to the spin-squared order but begins to fail at the spin-cubic order. An argument based on asymptotic conservation suggests that it is impossible to restore the conservation at the spin-cubic order by a further deformation of the probe action. We compare our results with related observations for Kerr black holes with gravitational interactions.

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Cite

BibTeXRIS
BibTeX
@article{kim2026integrability,
  title = {{On the integrability of root-Kerr probe dynamics}},
  author = {Sungsoo Kim and Sangmin Lee},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = oct,
  doi = {10.1007/jhep10(2026)065},
  url = {https://link.springer.com/10.1007/JHEP10(2026)065},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - On the integrability of root-Kerr probe dynamics
AU  - Sungsoo Kim
AU  - Sangmin Lee
PY  - 2026
DA  - 2026/10/07
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep10(2026)065
UR  - https://link.springer.com/10.1007/JHEP10(2026)065
AB  - A bstract : In the background of a Kerr-Newman black hole, the motion of a scalar particle is integrable by virtue of an extra conserved charge known as the Carter charge. When the particle is endowed with spin, it is known that another conserved charge, the Rüdiger charge, maintains the integrability at least at low orders in the spin magnitude. We explore the extent of this integrability in a simpler model where both the source and the probe are root-Kerr particles, the non-gravitating limit of the Kerr-Newman black hole. At the leading order in the probe charge, the integrability holds to all orders in the spin magnitude if the interaction vertices of the probe are dictated by the Newman-Janis shift. At the second order in the probe charge, the integrability can be extended to the spin-squared order but begins to fail at the spin-cubic order. An argument based on asymptotic conservation suggests that it is impossible to restore the conservation at the spin-cubic order by a further deformation of the probe action. We compare our results with related observations for Kerr black holes with gravitational interactions.
SN  - 1029-8479
ER  -