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Zeitschrift für Analysis und ihre Anwendungen


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Volume 27, Issue 1, 2008, pp. 11–30
DOI: 10.4171/ZAA/1341

Published online: 2008-03-31

A Sharp Stability Criterion for Soliton-Type Propagating Phase Boundaries in Korteweg's Model

Kevin Zumbrun[1]

(1) Indiana University, Bloomington, United States

Recently, Benzoni–Gavage, Danchin, Descombes, and Jamet have given a sufficient condition for linear and nonlinear stability of solitary wave solutions of Korteweg's model for phase-transitional isentropic gas dynamics in terms of convexity of a certain "moment of instability" with respect to wave speed, which is equivalent to variational stability with respect to the associated Hamiltonian energy under a partial subset of the constraints of motion; they conjecture that this condition is also necessary. Here, we compute a sharp criterion for spectral stability in terms of the second derivative of the Evans function at the origin, and show that it is equivalent to the variational condition obtained by Benzoni–Gavage et al., answering their conjecture in the positive.

Keywords: Stability, Evans function, Hamiltonian PDE

Zumbrun Kevin: A Sharp Stability Criterion for Soliton-Type Propagating Phase Boundaries in Korteweg's Model. Z. Anal. Anwend. 27 (2008), 11-30. doi: 10.4171/ZAA/1341