%0 Journal Article %A Elad Sayag %A Yehuda Shalom %T Entropy, ultralimits and the Poisson boundary %J Groups, geometry, and dynamics %D 2025 %P 525-565 %V 19 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4171/ggd/887/ %R 10.4171/ggd/887 %F 10_4171_ggd_887