A free boundary problem for the localization of eigenfunctions
  We study a variant of the Alt, Caffarelli, and Friedman free boundary problem with many phases and a slightly different volume term, which we originally designed to guess the localization of eigenfunctions of a Schr\"odinger operator in a domain. We prove Lipschitz bounds for the functions and some nondegeneracy and regularity properties for the domains. 
Guy David (LM-Orsay), Marcel Filoche (PMC), David Jerison (MIT),   Svitlana Mayboroda (UMN-MATH)
math.CA