The maximal-minor F-threshold formula for large determinantal rings

Let $R=S/I_t(X)$, where $X$ is an $n\times m$ matrix of indeterminates, $t=m\leq n$, and $c^{\mathfrak{m}}(\mathfrak{m})$ denotes the F-threshold of the homogeneous maximal ideal. The preceding results give the upper bound $c^{\mathfrak{m}}(\mathfrak{m})\leq n(t-\frac{1}{2})$. Maximal-minor F-threshold conjecture. In the context of this upper bound, $c^{\mathfrak{m}}(\mathfrak{m})=n(t-1)$ for all $t,n\geq 5$. This extends the formula proved in the paper for $t=m\in\{3,4\}$; the cases with both parameters at least $5$ remain conjectural.