Generation of semigroups for vector-valued pseudodifferential operators on the torus with space-dependent symbols

Abstract

We consider toroidal pseudodifferential operators with spatially dependent, operator-valued symbols of positive order and finite regularity. For an arbitrary complex Banach space $E$, we prove that the negative of the closure of a parabolic operator on $C^{\infty }({\mathbb{T}}^n,E)$ generates an analytic semigroup on $W_p^k({\mathbb{T}}^n,E)$, where $1\le p<\infty$ and $k\in {\mathbb{N}}_0$, provided the symbol has sufficiently many spatial derivatives and discrete differences. The proof combines uniform estimates for parameter-dependent kernels with right and left parametrices. It does not require the UMD property of $E$. Real interpolation gives corresponding resolvent estimates on $B_{pq}^s({\mathbb{T}}^n,E)$ for $0<s<k$ and $1\le q\le \infty$. The induced semigroups are strongly continuous for $q<\infty$ and on the little Besov spaces when $q=\infty$.

arXiv comment34 pages