Modulational instability mechanisms in exciton-polariton condensates Romuald Kamdem Tamwa, Alexis Paldou Yaya and Guy Richard Kol Eur. Phys. J. Plus, 139 4 (2024) 355 Published online: 26 April 2024 DOI: 10.1140/epjp/s13360-024-05105-2