title: Hamiltonian averaging for solitons with nonlinearity management.
abstract: We revisit the averaged equation, derived in Phys. Rev. Lett. 91, 240201 (2003)] from the nonlinear Schrödinger (NLS) equation with the nonlinearity management. We show that this averaged equation is valid only at the initial time interval, while a new Hamiltonian averaged NLS equation can be used at longer time intervals. Using the new averaged equation, we construct numerically matter-wave solitons in the context of the Bose-Einstein condensates under the Feshbach resonance management. We show that there is no threshold on the existence of dark solitons of large amplitudes, whereas such a threshold exists for bright solitons.
authors.affiliation: Department of Mathematics, McMaster University, Hamilton, Ontario, Canada.
authors.forename: D E
authors.initials: DE
authors.lastname: Pelinovsky
authors.forename: P G
authors.initials: PG
authors.lastname: Kevrekidis
authors.forename: D J
authors.initials: DJ
authors.lastname: Frantzeskakis
authors.forename: V
authors.initials: V
authors.lastname: Zharnitsky