  In 2004, I described a relativistic version of the Ghirardi-Rimini-Weber
(GRW) model of spontaneous wave function collapse for N non-interacting
distinguishable particles. Here I present a generalized version for N
interacting distinguishable particles. Presently, I do not know how to set up a
similar model for indistinguishable particles or a variable number of
particles. The present interacting model is constructed from a given
interacting unitary Tomonaga-Schwinger type evolution between spacelike
hypersurfaces, into which discrete collapses are inserted. I assume that this
unitary evolution is interaction-local (i.e., no interaction at spacelike
separation). The model is formulated in terms of Bell's flash ontology but is
also compatible with Ghirardi's matter density ontology. It is non-local and
satisfies microscopic parameter independence and no-signaling; it also works in
curved space-time; in the non-relativistic limit, it reduces to the known
non-relativistic GRW model.
