## Abstract

This paper is concerned with the asymptotic stability of degenerate stationary waves for viscous gases in the half space. We discuss the following two cases: (1) viscous conservation laws and (2) damped wave equations with nonlinear convection. In each case, we prove that the solution converges to the corresponding degenerate stationary wave at the rate t^{-α/4} as t → ∞, provided that the initial perturbation is in the weighted space L^{2}_{α}=L^{2}(ℝ_{+};(1+x)^{α}dx). This convergence rate t^{-α/4} is weaker than the one for the non-degenerate case and requires the restriction α < α_{*}(q), where α_{*}(q) is the critical value depending only on the degeneracy exponent q. Such a restriction is reasonable because the corresponding linearized operator for viscous conservation laws cannot be dissipative in L^{2}_{α} for α > α ^{*}(q) with another critical value α^{*}(q). Our stability analysis is based on the space-time weighted energy method in which the spatial weight is chosen as a function of the degenerate stationary wave.

Original language | English |
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Pages (from-to) | 735-762 |

Number of pages | 28 |

Journal | Archive for Rational Mechanics and Analysis |

Volume | 198 |

Issue number | 3 |

DOIs | |

Publication status | Published - 2010 Sept 17 |

Externally published | Yes |

## ASJC Scopus subject areas

- Analysis
- Mathematics (miscellaneous)
- Mechanical Engineering