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arXiv 1301.4979math.AP
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强阻尼wave equations方程的渐近抛物性

Asymptotic parabolicity for strongly damped wave equations

Genni Fragnelli, Gisèle Ruiz Goldstein, Jerome A. Goldstein, Silvia Romanelli

摘要:

对于Hilbert空间上的正自伴算子$S$,如果$F$是正Borel函数,则\[ \frac{d^2u}{dt}(t) + 2 F(S)\frac{du}{dt}(t) + S^2u(t)=0 \]描述了一类具有强摩擦或阻尼的波动方程.在适当的假设下,证明了\[ u(t)=v(t)+ w(t) \](其中$v$满足\[ 2F(S)\frac{dv}{dt}(t)+ S^2v(t)=0 \]和\[ \frac{w(t)}{\|v(t)\|} \rightarrow 0, \; \text{as} \; t \rightarrow +\infty. \])。所需的初始条件$v(0)$以规范的方式给出,并以$u(0)$,$u'(0)$表示。

英文摘要:

For $S$ a positive selfadjoint operator on a Hilbert space, \[ \frac{d^2u}{dt}(t) + 2 F(S)\frac{du}{dt}(t) + S^2u(t)=0 \] describes a class of wave equations with strong friction or damping if $F$ is a positive Borel function. Under suitable hypotheses, it is shown that \[ u(t)=v(t)+ w(t) \] where $v$ satisfies \[ 2F(S)\frac{dv}{dt}(t)+ S^2v(t)=0 \] and \[ \frac{w(t)}{\|v(t)\|} \rightarrow 0, \; \text{as} \; t \rightarrow +\infty. \] The required initial condition $v(0)$ is given in a canonical way in terms of $u(0)$, $u'(0)$.

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