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We study the turbulence transition of plane Couette flow in large domainswhere localised perturbations are observed to generate growing turbulent spots.Extending previous studies on the boundary between laminar and turbulentdynamics we determine invariant structures intermediate between laminar andturbulent flow. In wide but short domains we find states that are localised inspanwise direction, and in wide and long domains the states are also localisedin downstream direction. These localised states act as critical nuclei for thetransition to turbulence in spatially extended domains.

Localised edge states nucleate turbulence in extended plane Couette cells