19 citations · 21 across the 12 of their papers we have counts for
10 papers · 1 filter
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…
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…