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arXiv:math/0506089 [math.AP]AbstractReferencesReviewsResources

Quasi-periodic solutions of the equation v_{tt}-v_{xx}+v^3=f(v)

Pietro Baldi

Published 2005-06-05, updated 2005-07-06Version 2

We consider 1D completely resonant nonlinear wave equations of the type v_{tt}-v_{xx}=-v^3+O(v^4) with spatial periodic boundary conditions. We prove the existence of a new type of quasi-periodic small amplitude solutions with two frequencies, for more general nonlinearities. These solutions turn out to be, at the first order, the superposition of a traveling wave and a modulation of long period, depending only on time.

Comments: 20 pages. Corrected some misprints, added a reference, moved Proposition and Lemma 1 from Section 2 to the Appendix
Categories: math.AP
Subjects: 35L05, 35B15, 37K50
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