AUTHOR=Boyanov Valentin 

TITLE=On destabilising quasi-normal modes with a radially concentrated perturbation

JOURNAL=Frontiers in Physics

VOLUME=12

YEAR=2025

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2024.1511757

DOI=10.3389/fphy.2024.1511757

ISSN=2296-424X