An interpolation approach to Schoenberg type inequalities

Abstract: The classical Schoenberg inequality relates the squared moduli of the critical points of a polynomial to those of its zeros, under the condition that the centroid of the zeros lies at the origin. Its generalizations to other orders are referred to as Schoenberg type inequalities. While higher-order analogues have been established for certain even exponents, the general case remains poorly understood. In this paper, we substantially extend the known results by introducing an interpolation-based framework that unifies the treatment of Schoenberg type inequalities across a continuum of exponents. Our approach employs complex interpolation between $\ell^p$ spaces and Schatten $p$-classes $S_p$, yielding sharp Schoenberg type inequalities of order $p$ for all $p \ge 1$, including previously inaccessible intermediate exponents. This completely resolves an open problem posed by Kushel and Tyaglov. In the process, we also provide a new proof of the Schoenberg type inequality of order $1$.