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Global existence problems for non-linear critical evolution equations with small initial data and semi-classical analysis

Global existence problems for non-linear critical evolution equations with small initial data and semi-classical analysis

In this thesis we study the problem of global existence of solutions to critical quasi-linear Klein-Gordon equations – or to critical quasi-linear coupled wave-Klein-Gordon systems – when initial data are small, smooth, decaying at infinity, in space dimension one or two. We first study this problem for Klein-Gordon equations with …