title: Reconstruction of chaotic saddles by classification of unstable periodic orbits: Kuramoto-Sivashinsky equation.
abstract: The unstable periodic orbits (UPOs) embedded in a chaotic attractor after an attractor merging crisis (MC) are classified into three subsets, and employed to reconstruct chaotic saddles in the Kuramoto-Sivashinsky equation. It is shown that in the post-MC regime, the two chaotic saddles evolved from the two coexisting chaotic attractors before crisis can be reconstructed from the UPOs embedded in the pre-MC chaotic attractors. The reconstruction also involves the detection of the mediating UPO responsible for the crisis, and the UPOs created after crisis that fill the gap regions of the chaotic saddles. We show that the gap UPOs originate from saddle-node, period-doubling, and pitchfork bifurcations inside the periodic windows in the post-MC chaotic region of the bifurcation diagram. The chaotic attractor in the post-MC regime is found to be the closure of gap UPOs.
authors.affiliation: Graduate School of Commerce and Management, Hitotsubashi University, Tokyo 186-8601, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Saiki
authors.affiliation: Research Institute for Mathematical Sciences (RIMS), Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Michio
authors.initials: M
authors.lastname: Yamada
authors.affiliation: Paris Observatory, LESIA, CNRS, 92195 Meudon, France.
authors.forename: Abraham C-L
authors.initials: AC
authors.lastname: Chian
authors.affiliation: Faculty UnB-Gama, and Plasma Physics Laboratory, Institute of Physics, University of Brasília (UnB), Brasília DF 70910-900, Brazil.
authors.forename: Rodrigo A
authors.initials: RA
authors.lastname: Miranda
authors.affiliation: Institute of Aeronautical Technology (ITA) and World Institute for Space Environment Research (WISER), São José dos Campos, São Paulo 12228-900, Brazil.
authors.forename: Erico L
authors.initials: EL
authors.lastname: Rempel
mesh_terms: D017711:Nonlinear Dynamics