 GRW matter-density ontology

A version of the GRW model in which matter is the ordinary-space density $m(x,t)={\sum }_i{m}_i\int dq{\delta }^{(3)}(x-q_i)|\Psi (q,t){|}^2$. This density is proposed as physical matter, rather than ignorance over hidden point positions. A dominant localized density supplies approximate object locations.