9 papers
Incidence Relations for Self-Dual Black Holes
Joon-Hwi Kim
In Penrose's nonlinear graviton construction, a self-dual spacetime arises as the moduli space of holomorphic twistor lines in curved twistor space, whose explicit parametrization…
Universality in Relativistic Spinning Particle Models
Joon-Hwi Kim, Sangmin Lee
We establish an equivalence between massive spinning particle models in four spacetime dimensions coupled to electromagnetism or gravity, within the spin-magnitude-preserving secto…
Covariant Symplectic Geometry of Classical Particles
Joon-Hwi Kim
We investigate the tension between symplecticity and gauge covariance in classical Hamiltonian mechanics. The pursuit of manifest covariance over manifest symplecticity results in…
The Kerr-Newman two-twistor particle
Joon-Hwi Kim
An all-orders worldline effective action for Kerr-Newman black hole is achieved in twistor particle theory. Exact hidden symmetries are identified in self-dual backgrounds.
The Kerr two-twistor particle
Joon-Hwi Kim
An all-orders worldline effective action for Kerr black hole is achieved in twistor particle theory.
Newman-Janis Algorithm from Taub-NUT Instantons
Joon-Hwi Kim
It is shown that the Kerr metric represents the nonlinear superposition of self-dual and anti-self-dual Taub-NUT instantons. This promotes the Newman-Janis algorithm to a rigorous…