Radon measures in the Berkovich space and generically stable measures in ACVF

In this paper we study Keisler measures in models of ACVF. We give analogue definitions for a Keisler measure to be orthogonal to the value group and stably dominated using unique extensions, in the spirit of invariant types. Our first theorem shows that a global $M$-invariant Keisler measure is generically stable if and only if it is orthogonal to the value group if and only if it is stably dominated. This theorem is later applied to prove that for a projective variety $X$ defined over a spherically complete model $M$ of ACVF whose value group is $\mathbb{R}$, there is a one-to-one correspondance between the generically stable measures centered on $X$ and the Radon measures on its Berkovich analyfication of $X$. Such theorem is a measure-theoretic extension of the celebrated work of Hrushovski-Loeser, which establishes a correspondence between generically stable types with the points of the Berkovich analyfication $X^{an}$ of a projective variety$X$. As an application, normalized Chambert-Loir measures associated with semipositive continuous metrics naturally give rise examples of generically stable Keisler measures.