4 papers · 1 filter
Phase Space Formulation of S-matrix
Joon-Hwi Kim
We establish an exact relation between the S-symplectomorphism and the S-matrix by means of the phase space formulation of quantum mechanics. The adjoint action of the S-matrix def…
Manifest symplecticity in classical scattering
Joon-Hwi Kim
The Liouville theorem states that classical time evolution is an incompressible flow in phase space. We investigate two formulations of classical mechanics in which this property i…
Double copy and the double Poisson bracket
Joon-Hwi Kim
We derive first-order and second-order field equations from ambitwistor spaces as phase spaces of massless particles. In particular, the second-order field equations of Yang-Mills…
Worldline formalism in phase space
Joon-Hwi Kim
We implement the worldline formalism in phase space to compute scattering amplitudes. First, the Feynman rules exhibit several useful universal features, reflecting elements of the…