title: Ring dark and antidark solitons in nonlocal media.
abstract: Ring dark and antidark solitons in nonlocal media are found. These structures have, respectively, the form of annular dips or humps on top of a stable CW background, and exist in a weak or strong nonlocality regime, defined by the sign of a characteristic parameter. It is demonstrated analytically that these solitons satisfy an effective cylindrical Kadomtsev-Petviashvili (aka Johnson's) equation and, as such, can be written explicitly in closed form. Numerical simulations show that they propagate undistorted and undergo quasi-elastic collisions, attesting to their stability properties.
authors.forename: Theodoros P
authors.initials: TP
authors.lastname: Horikis
authors.forename: Dimitrios J
authors.initials: DJ
authors.lastname: Frantzeskakis