Authors of paper: D.F. Gordon, B. Hafizi
Link to paper: https://www.sciencedirect.com/science/article/abs/pii/S0010465520303015?via%3Dihub
Abstract: An exact momentum update useful for particle codes was previously given. The expressions involved were unwieldy. By treating the momentum as a representation of SU(2)SU(2) instead of SO(3,1), a more compact expression for the exact momentum update is obtained. An expansion in powers of the timestep can be formulated such that invariance properties are exactly preserved, and push rates comparable to the standard Boris pusher are obtained.
Notebook by: Óscar Amaro