Serantes, AlexandreTravieso Mayo, DavidMas Solé, Javier2025-07-152025-07-152025-01-152470-0010https://hdl.handle.net/10347/42485We investigate the nonlinear stability of global anti–de Sitter space in the presence of multitrace deformations utilizing an Einstein-Klein-Gordon system with a top-down scalar potential. Our numerical simulations show that marginal and irrelevant deformations retain the nonlinear instability originally found by Bizoń and Rostworowski, while relevant deformations disrupt it. We show that the nonlinear impact of multitrace deformations is in one-to-one correspondence with how they affect the resonant character of the global anti–de Sitter normal mode eigenfrequency spectrum.engPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article10.1103/PhysRevD.111.0240442470-0029open access