title: Recurrent noise-induced phase singularities in drifting patterns.
abstract: We show that the key ingredients for creating recurrent traveling spatial phase defects in drifting patterns are a noise-sustained structure regime together with the vicinity of a phase transition, that is, a spatial region where the control parameter lies close to the threshold for pattern formation. They both generate specific favorable initial conditions for local spatial gradients, phase, and/or amplitude. Predictions from the stochastic convective Ginzburg-Landau equation with real coefficients agree quite well with experiments carried out on a Kerr medium submitted to shifted optical feedback that evidence noise-induced traveling phase slips and vortex phase-singularities.
authors.affiliation: Departamento de Física, FCFM, Universidad de Chile, Casilla 487-3, Santiago, Chile.
authors.forename: M G
authors.initials: MG
authors.lastname: Clerc
authors.affiliation: Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS UMR 8523, Université Lille1, 59655 Villeneuve d'Ascq Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Coulibaly
authors.affiliation: Departamento de Física, FCFM, Universidad de Chile, Casilla 487-3, Santiago, Chile.
authors.forename: F
authors.initials: F
authors.lastname: del Campo
authors.affiliation: Instituto de Física, Pontificia Universidad Católica de Valparaíso, Avenida Brasil, Valparaíso, Casilla 2950, Chile.
authors.forename: M A
authors.initials: MA
authors.lastname: Garcia-Nustes
authors.affiliation: Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS UMR 8523, Université Lille1, 59655 Villeneuve d'Ascq Cedex, France.
authors.forename: E
authors.initials: E
authors.lastname: Louvergneaux
authors.affiliation: Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS UMR 8523, Université Lille1, 59655 Villeneuve d'Ascq Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Wilson