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Interaction quench in a Lieb–Liniger model and the KPZ equation with flat initial conditions

Recent exact solutions of the 1D Kardar–Parisi–Zhang equation make use of the 1D integrable Lieb–Liniger model of interacting bosons. For flat initial conditions, it requires the knowledge of the overlap between the uniform state and arbitrary exact Bethe eigenstates. The same quantity is also central in the study of the quantum quench from a 1D non-interacting Bose–Einstein condensate upon turning interactions. We compare recent advances in both domains, i.e. our previous exact solution, and a new conjecture by De Nardis et al. This leads to new exact results and conjectures for both the quantum quench and the KPZ problem.