title: Spiral waves in a coupled network of sine-circle maps.
abstract: A coupled two-dimensional lattice of sine-circle maps is investigated numerically as a simple model for coupled network of nonlinear oscillators under a spatially uniform, temporally periodic, external forcing. Various patterns, including quasiperiodic spiral waves, periodic, banded spiral waves in several different polygonal shapes, and domain patterns, are observed. The banded spiral waves and domain patterns match well with the results of earlier experimental studies. Several transitions are analyzed. Among others, the source-sink transition of a quasiperiodic spiral wave and the cascade of "side-doubling" bifurcations of polygonal spiral waves are of great interest.
authors.affiliation: National Creative Research Initiative Center for Neuro-dynamics and Department of Physics, Korea University, Seoul 136-701, Korea.
authors.forename: Sung-Jae
authors.initials: SJ
authors.lastname: Woo
authors.forename: Jysoo
authors.initials: J
authors.lastname: Lee
authors.forename: Kyoung J
authors.initials: KJ
authors.lastname: Lee