Syzygies of A Tower of Compact Local Hermitian Symmetric Spaces of Finite Type

Abstract

Let $X$ be a $n$ dimensional compact local Hermitian symmetric space of non-compact type and $L=\shO(K_X)\tens\shO(qM)$ be an adjoint line bundle. Let $c>0$ be a constant. Assume the curvature of $M$ is $\ge c\omega$, where $\omega$ is the kähler form of $X$, and $X$'s injectivity radius has a lower bound $\tau >\sqrt{2e}$, where $e$ is the Euler number. In this article, we prove that if $q>\frac{2e}{c\tau }\cdot (p+1)n$, then $L$ enjoys Property $N_p$. Applying this result to a tower of compact local Hermitian symmetric spaces $\cdots\mapto X_{s+1}\mapto X_s\mapto\cdots\mapto X_0=X$, we prove that $2K_s$ has Properties $N_p$ for $s\gg 0$ and fixed $p$. Based on the same technique, we show a criterion of projective normality of algebraic curves and a division theorem with small power difference.