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20172026
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math.DG2026

Finite time singularities of the Ricci flow on compact Kähler surfaces are of Type I

Charles Cifarelli, Ronan Conlon, Max Hallgren +1

For any volume-collapsing finite-time singularity of a Kähler-Ricci flow on a compact Kähler surface, we show the flow satisfies a Type I curvature bound and classify the correspon…

math.DG2025

An -Regularity Theorem for Non-collapsed Ricci Flow

Harry Fluck, Max Hallgren

In this article we prove an -regularity theorem for non-collapsed Ricci flows, and use this to prove new estimates for singularity models of Fano Kähler-Ricci flows. In the cour…

math.DG2025

Remarks on Singular Kähler-Einstein Metrics

Max Hallgren, Gábor Székelyhidi

We study two different natural notions of singular Kähler-Einstein metrics on normal complex varieties. In the setting of singular Ricci flat Kähler cone metrics that arise as non-…

math.DG2025

On Kähler-Einstein Currents

Yifan Chen, Shih-Kai Chiu, Max Hallgren +3

We show that a general class of singular Kähler metrics with Ricci curvature bounded below define Kähler currents. In particular the result applies to singular Kähler-Einstein metr…

math.DG2025

Non-collapsed finite time singularities of the Ricci flow on compact Kähler surfaces are of Type I

Ronan J. Conlon, Max Hallgren, Zilu Ma

We show that any non-collapsed finite time singularity of the Ricci flow on a compact Kähler surface is of Type I. Combined with a previous result of the first author, Cifarelli, a…

math.DG2023

Kähler-Ricci Tangent Flows are Infinitesimally Algebraic

Max Hallgren

We show that any tangent cone of a singular shrinking Kähler-Ricci soliton is a normal affine algebraic variety. Moreover, the regular set of such a tangent cone in the metric sens…

math.DG2023

Geometric regularity of blow-up limits of the Kähler-Ricci flow

Max Hallgren, Wangjian Jian, Jian Song +1

We establish geometric regularity for Type I blow-up limits of the Kähler-Ricci flow based at any sequence of Ricci vertices. As a consequence, the limiting flow is continuous in t…