Pirinççiog˜lu N.Sert I.2019-10-262019-10-2620120008-42040008-4204https://doi.org/10.1139/p11-146https://hdl.handle.net/11454/18982Differences between scalar field and scalar density solutions are explored using a Robertson-Walker (RW) metric, and a nonrelativistic Hamiltonian is derived for a scalar density field in the post-newtonian approximation. The results are compared with those of a scalar field. The expanding universe in a RW metric and a post-newtonian solution of the Klein-Gordon equation are discussed separately. © 2012 Published by NRC Research Press.en10.1139/p11-146info:eu-repo/semantics/closedAccessArticle9019195Q3