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On the three-dimensional shape of a crystal

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arxiv 2406.00241 v1 pith:2WH7JZZE submitted 2024-06-01 math.AP math-phmath.DGmath.MP

classification math.APmath-phmath.DGmath.MP
keywords whenconvexconvexitycrystalpotentialproblemsmalltheorem
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abstract

In this paper we completely settle the Almgren problem in $\mathbb R^3$ under some generic conditions on the potential and tension functions. The problem, among other things, appears in classical thermodynamics when one is to understand if minimizing the free energy with convex potential and under a mass constraint generates a convex crystal. Our new idea in proving a three-dimensional convexity theorem is to utilize a stability theorem when $m$ is small, convexity when $m$ is small, and the first variation PDE with a new maximum principle approach.

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  1. The one-dimensional equilibrium shape of a crystal

    math-ph 2025-01 conditional novelty 5.0 of 10

    In one dimension, under g(0)=0, g>=0 and convex sub-level sets, every minimizer of the free energy with prescribed mass is an interval and a minimizer always exists.

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