Use of bundles of locally convex spaces in problems of convergence of semigroups of operators defined on different Banach spaces. Applications to spectral stability problems

Abstract

In this work we construct certain general bundles $<\mathfrak{M},\rho ,X>$ and $<\mathfrak{B},\eta ,X>$ of Hausdorff locally convex spaces associated with a given Banach bundle $<\mathfrak{E},\pi ,X>$. Then we present conditions ensuring the existence of bounded sections $\mathcal{U}\in {\Gamma }^{x_{\infty }}(\rho )$ and $\mathcal{P}\in {\Gamma }^{x_{\infty }}(\eta )$ both continuous at a point $x_{\infty }\in X$, such that $\mathcal{U}(x)$ is a $C_0-$semigroup of contractions on ${\mathfrak{E}}_x$ and $\mathcal{P}(x)$ is a spectral projector of the infinitesimal generator of the semigroup $\mathcal{U}(x)$, for every $x\in X$.

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