preprint

Inserted: 6 oct 2026
Last Updated: 6 oct 2026

Year: 2026

Abstract:

In this paper we prove the stability and the continuity of the free boundaries of two-phase and one-phase weak solutions to the Stefan problem in any dimension. Our proof has two main ingredients. The first one is an energy conservation principle for weak solutions that we derive for general domains in both the one-phase and the two-phase settings; this energy conservation principle provides the modulus of continuity for the displacement of the free boundary and is a flexible tool for analyzing long-time behavior of solutions. The second key ingredient for the control of the displacement of the free boundary is a new lower density bound for the melting region at free boundary points that move with maximal velocity. We also discuss some applications, showing a series of qualitative and quantitative results on the asymptotic behavior of weak solutions.