The $J$-equation on Kähler manifolds under a smooth boundary cone condition

Abstract

For a $n$-dimensional compact Kähler manifold $X$ with a pair of Kähler classes $(α,β)$, we show that the algebraically defined $J$-null locus is equal to the analytically defined $J$-non-ample locus under the assumption of $J$-bigness(which is automatic for semistable pair up to dimension $3$ \cite{3d}), and boundary cone condition $c_{α,β}ω^{n-1}-(n-1)ω^{n-2}\wedgeχ\geq 0$ for some Kähler form $ω\in α,χ\in β$. The key tool is the generalized Khovanskii-Teissier inequality associated to $J$ equation formulated by Collins \cite{CT21} and its extension to singular Kähler space.