On the existence and stability of solitary-wave solutions to a class of evolution equations of Whitham type
Författare
Summary, in English
We consider a class of pseudodifferential evolution equations of the form u(t) + (n(u) + Lu)(x) = 0, in which L is a linear smoothing operator and n is at least quadratic near the origin; this class includes in particular the Whitham equation. A family of solitary-wave solutions is found using a constrained minimization principle and concentration-compactness methods for noncoercive functionals. The solitary waves are approximated by (scalings of) the corresponding solutions to partial differential equations arising as weakly nonlinear approximations; in the case of the Whitham equation the approximation is the Korteweg-deVries equation. We also demonstrate that the family of solitary-wave solutions is conditionally energetically stable.
Avdelning/ar
- Matematik (naturvetenskapliga fakulteten)
- Partial differential equations
Publiceringsår
2012
Språk
Engelska
Sidor
2903-2936
Publikation/Tidskrift/Serie
Nonlinearity
Volym
25
Issue
10
Dokumenttyp
Artikel i tidskrift
Förlag
London Mathematical Society / IOP Science
Ämne
- Mathematics
Status
Published
Forskningsgrupp
- Partial differential equations
ISBN/ISSN/Övrigt
- ISSN: 0951-7715