title: Nonuniversality of elastic exponents in random bond-bending networks.
abstract: We numerically investigate the rigidity percolation transition in two-dimensional flexible, random rod networks with freely rotating cross links. Near the transition, networks are dominated by bending modes and the elastic modulii vanish with an exponent f=3.0+/-0.2, in contrast with central force percolation which shares the same geometric exponents. This indicates that universality for geometric quantities does not imply universality for elastic ones. The implications of this result for actin-fiber networks is discussed.
authors.affiliation: Division of Physics & Astronomy, Vrije Universiteit 1081 HV Amsterdam, The Netherlands.
authors.forename: D A
authors.initials: DA
authors.lastname: Head
authors.forename: F C
authors.initials: FC
authors.lastname: MacKintosh
authors.forename: A J
authors.initials: AJ
authors.lastname: Levine