Superlinear regularity of Frobenius powers on a normal hypersurface

We give answers to four questions on linear bounds for Frobenius powers. Let m denote the homogeneous maximal ideal. We construct a height-two prime I in a geometrically normal four-dimensional graded hypersurface R of characteristic two such that, for every power q≥16 of four, the Loewy length of H⁰ₘ(R/I[q]) is at least q3/2/8-1. Thus no fixed integer C gives annihilation by mCq for all q, as required by the Hochster--Huneke condition (LC). The same construction gives superlinear lower bounds for the Castelnuovo--Mumford regularity in Katzman's question, for the exponents of the embedded primary components in the question of Smith and Swanson, and for the degree in the least variable in Katzman's Gröbner basis conjecture. The bounds follow from the degree of the kernel line bundle of a multiplication pencil associated to a family of plane quartics.