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math.AP2025
Null coordinates for quasi-periodic -dimensional wave operators on the circle with applications to reducibility
Athanasios Chatzikaleas, Jacques Smulevici
Given any wave operator with principle part , where …
math.AP2023
Time periodic solutions and Nekhoroshev stability to non-linear massive Klein-Gordon equations in Anti-de Sitter
Athanasios Chatzikaleas, Jacques Smulevici
We prove the existence of time-periodic solutions to non-linear massive Klein-Gordon equations in Anti-de Sitter as well as their orbital stability over exponentially long times fo…