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arXiv · 2611.00595

L2-contraction and Asymptotic Stability of Monotone Shock Waves for Cubic and Quartic KdV-Burgers Equations

Yi Du·Tao Yan·Yushu Zeng·Shihui Zhu
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Abstract

We investigate the nonlinear stability of monotone traveling shock waves arising in the generalized Korteweg-de Vries-Burgers equation with a power-law flux, focusing on the cubic and quartic cases p=3 and p=4, respectively, in the presence of both dissipative and dispersive effects. Since shocks connecting distinct end states destroy the integrable structure of the equation, we introduce a slowly varying reference connection to establish global well-posedness for the Cauchy problem in an affine Sobolev space. A key ingredient in the stability analysis is to establish a new two-sided comparison estimate for the derivative of a monotone shock-wave profile. After a monotone coordinate transformation, this estimate allows the viscous dissipation to be compared with the natural vanishing weight arising in a shifted Poincare inequality. Together with an $L^\infty$ bootstrap controlling the higher-order relative-flux terms, this yields a global $L^2$-contraction property modulo a time-dependent shift for sufficiently small $H^1$ perturbations in the admissible parameter regimes. We obtain exponential decay of the shock profile and show asymptotic convergence to the shifted shock in $L^q(\R)$, $2<q\leq \infty$, with vanishing shift velocity.

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Yi Du, Tao Yan, Yushu Zeng, Shihui Zhu. 2026-10-31. L2-contraction and Asymptotic Stability of Monotone Shock Waves for Cubic and Quartic KdV-Burgers Equations. https://arxiv.org/abs/2611.00595

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