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math.AP2026

Geometric Gradient Flows from Elliptic Level Sets: Normal Decomposition and Reflection Dynamics

Mohammed Barkatou, Mohamed El Morsalani

We investigate the asymptotic geometry of shifting superlevel sets generated by solutions to the elliptic Dirichlet problem in , wher…

math.AP2026

Thickness functions for elliptic level sets: gradient formulas, normal expansions, and geometric remarks

Mohammed Barkatou

We study the geometry of superlevel sets of solutions to with compactly supported in a convex core . Under the radial monoto…

math.AP2026

Sharp existence conditions and geometric inheritance for overdetermined free boundary problems of Laplacian and bi-Laplacian type

Mohammed Barkatou, Samira Khatmi

This paper provides necessary and sufficient conditions for the existence of free boundaries in overdetermined problems for the Laplacian, and sufficient conditions for the bi-Lapl…

math.AP2026

The Return Map in the Class : Geometry, Dynamics, and Thickness Regularity

Mohammed Barkatou, Mohamed El Morsalani

We investigate a geometric dynamical mechanism arising in the class of domains containing a fixed convex set and satisfying two geometric normals properties int…

math.AP2026

Symmetry and Qualitative \& Quantitative Stability for a Class of Overdetermined Problems in C-GNP Domains with Source Supported in the Core

Mohammed Barkatou

We introduce a unified geometric framework for domains satisfying a geometric normal property (C-GNP) relative to a strictly convex set \(C\). Under the fundamental assumption that…