In a previous paper [G. Yoneda, Proc. R. Soc. London A445 (1994), 221.], we proved the no-interaction theorem for four particles with the assumption that the (linear and angular) momentum on space-like planes is invariant. In this paper, we assume that the momentum on null cones is invariant and prove that there is no interaction for four particles.
ASJC Scopus subject areas