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On long time existence for small solutions of semi-linear Klein-Gordon equations on the torus
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Journal Article
On long time existence for small solutions of semi-linear Klein-Gordon equations on the torus
2009
Overview
We prove that small smooth solutions of weakly semi-linear Klein-Gordon equations on the torus
(
d
≥ 2) exist over a larger time interval than the one given by local existence theory, for almost every value of the mass. We use a normal form method for the Sobolev energy of the solution. The difficulty, in comparison with previous results obtained on the sphere, comes from the fact that the set of differences of eigenvalues of
on
(
d
≥ 2) is dense in ℝ.
Publisher
The Hebrew University Magnes Press,Springer Nature B.V
