On sharp lower bounds for Calabi type functionals and destabilizing properties of gradient flows

Let $X$ be a compact K"ahler manifold with a given ample line bundle $L$. In \cite{Don05}, Donaldson proved that the Calabi energy of a K"ahler metric in $c_1(L)$ is bounded from below by the supremum of a normalized version of the minus Donaldson–Futaki invariants of test configurations of $(X,L)$. He also conjectured that the bound is sharp. In this paper, we prove a metric analogue of Donaldson’s conjecture, we show that if we enlarge the space of test configurations to the space of geodesic rays in ${\mathcal{E}}^2$ and replace the Donaldson–Futaki invariant by the radial Mabuchi K-energy $\mathbf{M}$, then a similar bound holds and the bound is indeed sharp. Moreover, we construct explicitly a minimizer of $\mathbf{M}$. On a Fano manifold, a similar sharp bound for the Ricci–Calabi energy is also derived.