## A. Chambolle - L. Ferrari - B. Merlet

# A phase-field approximation for the Steiner problem in dimension two

created by ferrari on 10 Feb 2017

modified on 27 Jun 2017

[

BibTeX]

*Advances in Calculus of Variations*

**Inserted:** 10 feb 2017

**Last Updated:** 27 jun 2017

**Year:** 2016

**Notes:**

24 pages, 8 figures

**Abstract:**

In this paper we consider the branched transportation problem in 2D associated with a cost per unit length of the form 1+αm where m denotes the amount of transported mass and α>0 is a fixed parameter (notice that the limit case α=0 corresponds to the classical Steiner problem). Motivated by the numerical approximation of this problem, we introduce a family of functionals ({Fϵ}ϵ>0) which approximate the above branched transport energy. We justify rigorously the approximation by establishing the equicoercivity and the Γ-convergence of {Fϵ} as ϵ↓0. Our functionals are modeled on the Ambrosio-Tortorelli functional and are easy to optimize in practice. We present numerical evidences of the efficiency of the method

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