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Well-posedness for strongly damped abstract Cauchy problems of fractional order
Published online by Cambridge University Press: 13 January 2025
Abstract
Let X be a complex Banach space and B be a closed linear operator with domain $\mathcal{D}(B) \subset X,\,\, a,b,c,d\in\mathbb{R},$ and
$0 \lt \beta \lt \alpha.$ We prove that the problem
\begin{equation*}u(t) -(aB+bI)(g_{\alpha-\beta}\ast u)(t) -(cB+dI)(g_{\alpha}\ast u)(t) = h(t), \quad t\geq 0,\end{equation*}
where $g_{\alpha}(t)=t^{\alpha-1}/\Gamma(\alpha)$ and
$h:\mathbb{R}_+\to X$ is given, has a unique solution for any initial condition on
$\mathcal{D}(B)\times X$ as long as the operator B generates an ad-hoc Laplace transformable and strongly continuous solution family
$\{R_{\alpha,\beta}(t)\}_{t\geq 0} \subset \mathcal{L}(X).$ It is shown that such a solution family exists whenever the pair
$(\alpha,\beta)$ belongs to a subset of the set
$(1,2]\times(0,1]$ and B is the generator of a cosine family or a C0-semigroup in
$X.$ In any case, it also depends on certain compatibility conditions on the real parameters
$a,b,c,d$ that must be satisfied.
- Type
- Research Article
- Information
- Copyright
- © The Author(s), 2025. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh
References
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