Kirchhoff equations from quasi-analytic to spectral-gap data

Details Kirchhoff equations from quasi-analytic to spectral-gap data Kirchhoff equations from quasi-analytic to spectral-gap data

2010-03-31

arxiv.org/abs/1003.5995v1

Mathematics

Analysis of PDEs

15 pages

Scientific paper

In a celebrated paper (Tokyo J. Math. 1984) K. Nishihara proved global existence for Kirchhoff equations in a special class of initial data which lies in between analytic functions and Gevrey spaces. This class was defined in terms of Fourier components with weights satisfying suitable convexity and integrability conditions. In this paper we extend this result by removing the convexity constraint, and by replacing Nishihara's integrability condition with the simpler integrability condition which appears in the usual characterization of quasi-analytic functions. After the convexity assumptions have been removed, the resulting theory reveals unexpected connections with some recent global existence results for spectral-gap data.

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