2026/07/24 by Siwar Ben Said
Mathematics · #math.AP
This article is concerned with the study of the focusing energy-critical wave equation on the three-dimensional Riemannian manifold M=ℝ3 equipped with a smooth time-independent Riemannian metric g, which coincides with the Euclidean metric outside a compact set. Our focus is on Type II blow-up solutions, namely finite-time solutions that remain bounded in the energy space, with the goal of revealing their fundamental properties. We establish in particular lower bounds for the energy norm as the solution approaches its maximal time of existence in terms of the bounds of the ground state of the Euclidean problem.