Entropy solutions for double-phase elliptic systems with $L^{1}$ source terms
Tom 136 / 2026
Annales Polonici Mathematici 136 (2026), 11-32
MSC: Primary 35A01; Secondary 35A15, 35J60, 35J66, 35J92
DOI: 10.4064/ap240818-30-4
Opublikowany online: 10 October 2025
Streszczenie
We investigate nonlinear elliptic equations that describe double-phase phenomena with a reaction term that is independent of the gradient (i.e., it only satisfies the $L^{1}$-data condition), subject to homogeneous Dirichlet boundary conditions. Using the theory of Musielak–Orlicz–Sobolev spaces, and under fairly general conditions, we demonstrate the existence of entropy solutions. This is achieved through a regularization method combined with a priori estimates developed by Boccardo and Gallouët.
