A new isoperimetric inequality for the elasticae

  • Dorin Bucur

    Université de Savoie, Le-Bourget-du-Lac, France
  • Antoine Henrot

    Université de Lorraine, Vandoeuvre-lès-Nancy, France


For a smooth curve , we define its elastic energy as where is the curvature. The main purpose of the paper is to prove that among all smooth, simply connected, bounded open sets of prescribed area in , the disc has the boundary with the least elastic energy. In other words, for any bounded simply connected domain , the following isoperimetric inequality holds: . The analysis relies on the minimization of the elastic energy of drops enclosing a prescribed area, for which we give as well an analytic answer.

Cite this article

Dorin Bucur, Antoine Henrot, A new isoperimetric inequality for the elasticae. J. Eur. Math. Soc. 19 (2017), no. 11, pp. 3355–3376

DOI 10.4171/JEMS/740