Global solutions to the Kirchhoff equation with spectral gap data in the energy space

We prove that the classical hyperbolic Kirchhoff equation admits global-in-time solutions for some classes of initial data in the energy space. We also show that there are enough such solutions so that every initial datum in the energy space is the sum of two initial data for which a global-in-time...

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Bibliographic Details
Published in:Nonlinear differential equations and applications 2024-07, Vol.31 (4), Article 48
Main Authors: Ghisi, Marina, Gobbino, Massimo
Format: Article
Language:English
Subjects:
Analysis
Low level
Mathematics
Mathematics and Statistics
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Summary:We prove that the classical hyperbolic Kirchhoff equation admits global-in-time solutions for some classes of initial data in the energy space. We also show that there are enough such solutions so that every initial datum in the energy space is the sum of two initial data for which a global-in-time solution exists. The proof relies on the notion of spectral gap data, namely initial data whose components vanish for large intervals of frequencies. We do not pass through the linearized equation, because it is not well-posed at this low level of regularity.
ISSN:1021-9722
1420-9004
DOI:10.1007/s00030-024-00933-8