Year: 2026
Type: preprint
Abstract: We establish the following Miyaoka-Yau inequality for any $n$-dimensional klt Fano variety $X$, possibly K-unstable, in terms of its delta invariant: \[\left(2(n+1)\widehat{c}_2(X)-n c_1(X)^2\right)\cdot c_1(X)^{n-2} \ge -n \left(1-\min\{1,δ(X)\}\right)^2 \cdot c_1(X)^n.\] Moreover, if equality holds in this inequality, then there exist a finite quasi-étale cover $\widehat{X} \to X$ and a positive integer $p$ such that $\widehat{X} \cong \mathbb{P}(1,\ldots, 1, p)$. We also discuss the relationship between Donaldson's conjecture and the Miyaoka-Yau inequality.
Source: arXiv (Cornell University)
Authors: Hisamoto, Tomoyuki, Iwai, Masataka
Institutions: Nagoya University, The University of Osaka
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7171676321