Absolute summability from diagonal operators to Carleson embeddings and Hankel operators

Abstract

The present paper consists of three parts, each building on the preceding one. In Part I, we characterize the scalar sequences $\mathbf b=\{b_k\}$ for which the diagonal operator $\mathscr{M}_{\mathbf b}\bigl(\{a_k\}\bigr):=\{b_ka_k\}$ is $r$-summing from $\ell^p$ to $\ell^q$ for \(1\le p,q\le \infty\) and \(1\le r<\infty\). This resolves a problem left open in Garling's 1974 classification of \(r\)-summing diagonal operators. In particular, in the previously unresolved exceptional range $\{(p,q,r):1 \max\{p',q\}\},$ we identify a new intermediate exponent \(\kappa\in(\max\{p',q\},r)\) and prove that \(\mathscr M_{\mathbf b}\) is \(r\)-summing if and only if \(\mathbf b\in\ell^\kappa\). In Part II, by developing two general transference principles for $r$-summability and building on the characterization from Part I, we characterize the positive Borel measures $\mu$ for which the Carleson embedding operator $J_\mu$ is $r$-summing from the weighted Bergman space $A_\alpha^p(\mathbb B_n)$ to $L^q(\mathbb B_n,d\mu)$ for $ 1\leq p,q<\infty$ , $1\leq r<\infty$, and $\alpha>-1$, thereby extending the existing theory to the full off-diagonal range. In Part III, building on the characterization from Part II, we characterize the symbols \(f\) and \(g\) for which the big and little Hankel operators \(H_f^\beta\) and \(h_{\bar g}^\beta\), respectively, are \(r\)-summing from \(A_\alpha^p(\mathbb B_n)\) to \(L^q(\mathbb B_n,dv_\beta)\), where $1\leq p<\infty$, $1 -1$, and \(dv_\beta(z):=c_\beta(1-|z|^2)^\beta\,dv(z)\). These characterizations appear to be new even in the diagonal case $p=q$ and $\alpha=\beta$.