19 citations · 21 across the 12 of their papers we have counts for
13 papers
Reimagining Gravity: Generalized Symmetries, Double Copy, and Spinning Black Holes
Joon-Hwi Kim
General relativity is a century-old subject. Yet modern explorations through generalized symmetries, scattering amplitudes, and effective field theory have raised open problems, mo…
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…
The Diagrammar of Quantum Magnusian
Li Guo, Joon-Hwi Kim, Jung-Wook Kim +3
The logarithm of the time-evolution operator has been termed Magnusian, on account of the fact that its expansion describes the Magnus series. The diagrammatic expansion and comput…
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…
Classical eikonal from Magnus expansion
Joon-Hwi Kim, Jung-Wook Kim, Sungsoo Kim +1
In a classical scattering problem, the classical eikonal is defined as the generator of the canonical transformation that maps in-states to out-states. It can be regarded as the cl…
Massive twistor worldline in electromagnetic fields
Joon-Hwi Kim, Jung-Wook Kim, Sangmin Lee
We study the (ambi-)twistor model for spinning particles interacting via electromagnetic field, as a toy model for studying classical dynamics of gravitating bodies including effec…
Single Kerr-Schild Metric for Taub-NUT Instanton
Joon-Hwi Kim
It is shown that a complex coordinate transformation maps the Taub-NUT instanton metric to a Kerr-Schild metric. This metric involves a semi-infinite line defect as the gravitation…
Generalized Symmetry in Dynamical Gravity
Clifford Cheung, Maria Derda, Joon-Hwi Kim +3
We explore generalized symmetry in the context of nonlinear dynamical gravity. Our basic strategy is to transcribe known results from Yang-Mills theory directly to gravity via the…
Asymptotic Spinspacetime
Joon-Hwi Kim
We show that Poincaré invariance directly implies the existence of a complexified Minkowski space whose real and imaginary directions unify spacetime and spin, which we dub spinspa…