Global well-posedness and long-time asymptotics for the focusing coupled Kundu--Eckhaus equation
Year: 2026
Type: preprint
Abstract: We prove global well-posedness in the Schwartz space and establish long-time asymptotics for the focusing coupled Kundu--Eckhaus (CKE) equation. For data with no discrete spectrum or real-axis spectral singularities, we analyze the associated matrix Riemann--Hilbert problem by the Deift--Zhou nonlinear steepest descent method. A quantitative local expansion of the full matrix factor near the stationary point identifies the unitary factor in the leading vector term. We combine an estimate for the full matrix coefficient at infinity with exact mass identities. This gives joint error estimates for the gauge-equivalent coupled nonlinear Schrödinger solution, the cumulative mass, and the gauge phase. These joint estimates yield an explicit asymptotic formula for CKE radiation with an $O(t^{-1}\log t)$ remainder, uniformly for $x/t$ in compact subsets of $\mathbb R$. We also compute the reflection coefficient and the unitary endpoint factor to visualize the asymptotic solution.
Source: arXiv (Cornell University)
Authors: Qiu, Tianwei, Wang, Zhen
Institution: Beihang University
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Award: G1544116732
OpenAlex ID: W7221795143