Uniqueness of tangent currents for positive closed currents

TL;DR

This paper proves the uniqueness of tangent currents for positive closed currents on complex manifolds under certain convergence conditions, extending previous results and with applications in intersection theory.

Contribution

It generalizes the criterion for tangent current uniqueness from zero-dimensional submanifolds to higher-dimensional cases in complex geometry.

Findings

Unique tangent currents exist under specified convergence conditions.

For currents of integration over analytic sets, the convergence condition is satisfied.

The results extend previous work by Blel-Demailly-Mouzali to higher-dimensional submanifolds.

Abstract

Let $X$ be a complex manifold $X$ of dimension $k,$ and let $V\subset X$ be a K\"ahler submanifold of dimension $l,$ and let $B\subset V$ be a piecewise $\mathcal{C}^2$-smooth domain. Let $T$ be a positive closed currents of bidegree $(p,p)$ in $X$ such that $T$ satisfies a mild reasonable assumption in a neighborhood of $\partial B$ in $X$ and that the $j$-th average mean $\nu_j(T,B,r)$ for every $j$ with $\max(0,l-p)\leq j\leq\min(l,k-p)$ converges sufficiently fast to the $j$-th generalized Lelong number $\nu_j(T,B)$ as $r$ tends to $0$ so that $r^{-1}(\nu_j(T, B,r)-\nu_j( T,B))$ is locally integrable near $r=0.$ Then we show that $T$ admits a unique tangent current along $B.$ A local version where we replace the condition of $T$ near $B$ by the conditions on a finite cover of $B$ by piecewise $\mathcal{C}^2$-smooth domains in $V$ is also given. When $T$ is a current of integration over a complex analytic set, we show that $\nu_j(T,B,r)-\nu_j(T,B)=O(r^\rho)$ for some $\rho>0,$ and hence this condition is satisfied. Our result may be viewed as a natural generalization of Blel-Demailly-Mouzali's criterion from the case $l=0$ to the case $l>0.$ The result has applications in the intersection theory of positive closed currents.