On the integrability of root-Kerr probe dynamics

TL;DR

This paper investigates the integrability of root-Kerr probe dynamics, revealing conditions under which conserved charges are maintained or broken at different orders of spin and charge interactions.

Contribution

It demonstrates that integrability persists at leading order with Newman-Janis shift but fails at higher orders, providing insights into conserved charges in simplified Kerr models.

Findings

Integrability holds at leading order in probe charge and all orders in spin with Newman-Janis shift.

At second order in probe charge, integrability extends to spin-squared but not to spin-cubic order.

Restoring conservation at spin-cubic order appears impossible through further deformations of the probe action.

Abstract

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 Carter charge. When the particle is endowed with spin, it is known that another conserved charge, the R\"udiger 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.