title: Convergence of density-matrix expansions for nuclear interactions.
abstract: We extend density-matrix expansions in nuclei to higher orders in derivatives of densities and test their convergence properties. The expansions allow for converting the interaction energies characteristic to finite- and short-range nuclear effective forces into quasilocal density functionals. We also propose a new type of expansion that has excellent convergence properties when benchmarked against the binding energies obtained for the Gogny interaction.
authors.affiliation: Department of Physics, Post Office Box 35 (YFL), FI-40014 University of Jyväskylä, Finland.
authors.forename: B G
authors.initials: BG
authors.lastname: Carlsson
authors.forename: J
authors.initials: J
authors.lastname: Dobaczewski