2013

Persistency of Analyticity for Nonlinear Wave Equations: An Energy-like Approach

Guo, Yanqiu, Titi, Edriss S.

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We study the persistence of the Gevrey class regularity of solutions to nonlinear wave equations with real analytic nonlinearity.

  • Specifically, it is proven that the solution remains in a Gevrey class, with respect to some of its spatial variables, during its whole life-span, provided the initial data is from the same Gevrey class with respect to these spatial variables.
  • In addition, for the special Gevrey class of analytic functions, we find a lower bound for the radius of the spatial analyticity of the solution that might shrink either algebraically or exponentially, in time, depending on the structure of the nonlinearity.
  • The standard $L^2$ theory for the Gevrey class regularity is employed; we also employ energy-like methods for a generalized version of Gevrey classes based on the $\ell^1$ norm of Fourier transforms (Wiener algebra).

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