Admissible HYM metrics on klt KE varieties and the MY equality for big anticanonical K-stable varieties

Abstract

This short note includes three results: $(1)$ If a reflexive sheaf $\mathcal{E}$ on a log terminal Kähler-Einstein variety $(X,\omega )$ is slope stable with respect to a singular Kähler-Einstein metric $\omega$, then $\mathcal{E}$ admits an $\omega$-admissible Hermitian-Yang-Mills metric. $(2)$ If a K-stable log terminal projective variety with big anti-canonical divisor satisfies the equality of the Miyaoka-Yau inequality in the sense of \cite{IJZ25}, then its anti-canonical model admits a quasi-étale cover from $\mathbb{C}{P}^n$. $(3)$ There exists a holomorphic rank 3 vector bundle on a compact complex surface which is semistable for some nef and big line bundle, but it is not semistable for any ample line bundles.

13 pages. Comments are wellcome!