Figure 1

Illustration of the dynamical evolution of a two-component Bose gas, with a focus on the possible transition between far-from-equilibrium transient states.

The set in the bottom left corner represents an ensemble of out-of-equilibrium initial states. Amongst these, a subset subjected to a dynamical instability is marked in white. It is chosen such that for all values of the the ratio α of inter- to intra-species couplings the system belongs to the unstable subset. Subsequently, the time evolution of the closed system leads to non- and quasi-topological defect formation. The type of defects created determines the scaling in the low-momentum regime of the particle spectrum of the gas. Our results reveal three different scalings corresponding to three types of defect configurations and a dynamical transition between the far-from-equilibrium universal states.