Fock Projections between Gaussian Mixed-Norm Spaces: Full-Range Boundedness and Compactness

Abstract

The Fock--Bargmann projection \(P_t\) is initially an orthogonal projection on a Gaussian Hilbert space. We characterize the boundedness and compactness of \[ P_t:L_α^{p_1,q_1}\longrightarrow \mathcal F_β^{p_2,q_2} \] and of its associated maximal projection \[ P_t^+:L_α^{p_1,q_1}\longrightarrow L_β^{p_2,q_2} \] for all \(t,α,β>0\) and \(0<p_1,q_1,p_2,q_2\le\infty\). Set \[ Δ(t;α,β):=t^2-2βt+αβ, \qquad d(p,q):=\frac1q-\frac1p. \] For both operators, boundedness holds exactly when \(p_1,q_1\ge1\) and either \(Δ(t;α,β)<0\), or \(Δ(t;α,β)=0\) with \[ q_1\le q_2, \qquad d(p_2,q_2)\le d(p_1,q_1). \] Both operators are compact exactly when \(p_1,q_1\ge1\) and either \(Δ(t;α,β)<0\), or \(Δ(t;α,β)=0\) with both of the above boundary inequalities strict. Thus boundedness forces the source exponents into the Banach range, whereas when \(Δ(t;α,β)<0\), every target exponent is admissible, including quasi-Banach ones. Annular discretization reduces the problem to drifted Gaussian sequence operators, whose comparison with diagonal sequence operators yields the endpoint criteria and quantitative tail estimates. A dilation--multiplier transfer gives corresponding results for Gaussian-twisted Fock operators, including Berezin transforms.