A new geometric construction of quasi-periodic null coordinates reduces the top-order terms of 1+1 wave operators to constant coefficients, yielding a streamlined reducibility proof for the quasi-periodically forced Klein-Gordon equation.
K AM theory for the Hamiltonian derivative wave equation
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Null coordinates for quasi-periodic $(1+1)$-dimensional wave operators on the circle with applications to reducibility
A new geometric construction of quasi-periodic null coordinates reduces the top-order terms of 1+1 wave operators to constant coefficients, yielding a streamlined reducibility proof for the quasi-periodically forced Klein-Gordon equation.