title: N-Body interactions in soft-sphere coarse-grained models of star polymers.
abstract: We consider the coarse-grained approach in which star polymers are mapped onto atoms located at the centers of the stars interacting by means of ultrasoft potentials. We generalize the Witten-Pincus formula to all n-body potentials: in the good-solvent regime all potentials show an ultrasoft logarithmic divergence when the relative distance of all n stars goes to zero, with coefficients that can be related to the partition-function exponents γ(f).
authors.affiliation: Dipartimento di Fisica dell'Università di Roma La Sapienza and INFN, Piazzale Aldo Moro 2, I-00185 Roma, Italy. andrea.pelissetto@roma1.infn.it
authors.forename: Andrea
authors.initials: A
authors.lastname: Pelissetto
mesh_terms: D003102:Colloids / Q000737:chemistry*; D003198:Computer Simulation; D008956:Models, Chemical; D008958:Models, Molecular; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure*; D011108:Polymers / Q000737:chemistry*
chemical_list: D003102:Colloids; D011108:Polymers