Carleson Measures and Integral Operators on Fock--Sobolev Spaces

Abstract

For integers $n\ge1$ and $N\ge0$, let $\mathbf g=(g_0,\ldots,g_N)$ be a vector of entire functions. We consider the generalized integral operator \ [T_{\mathbf g}^{(n,N)}f =I^n\!\left(\sum_{j=0}^N g_jf^{(j)}\right), \qquad (Ih)(z)=\int_0^z h(w)\dd w. \] We characterize its boundedness and compactness between Fock--Sobolev spaces $\F_m^p$ and $\F_\ell^q$, where $0<p,q<\infty$ and $m,\ell\ge0$ are integers. The coefficients of critical total degree determine the operator modulo compact operators and yield essential-norm estimates. In the Hilbert case, a Laurent Toeplitz representation gives the exact essential norm, a Fredholm criterion and an index formula. As an application, we obtain conditions for solutions of linear differential equations to belong to Fock--Sobolev spaces, including a necessary and sufficient polynomial zero condition in the Hilbert case. For entire functions $u_0,\ldots,u_N$ and $φ$, we also characterize boundedness, compactness and essential norms of the operators \[ L_{\mathbf u,φ}^{(N)}f =\sum_{j=0}^N u_j\,f^{(j)}\circφ. \] The proofs use Carleson measure characterizations for finite sums of weighted differentiation operators on Fock--Sobolev spaces.