Heteroclinic travelling waves of gradient diffusion systems
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- by Nicholas D. Alikakos and Nikolaos I. Katzourakis PDF
- Trans. Amer. Math. Soc. 363 (2011), 1365-1397 Request permission
Abstract:
We establish the existence of travelling waves to the gradient system $u_t = u_{zz} - \nabla W(u)$ connecting two minima of $W$ when $u : \mathbb {R} \times (0,\infty ) \longrightarrow \mathbb {R}^N$; that is, we establish the existence of a pair $(U,c) \in [C^2(\mathbb {R})]^N \times (0,\infty )$, satisfying \[ \left \{\begin {array}{l} U_{xx} - \nabla W ( U ) = - c\; U_x,\\ U(\pm \infty ) = a^{\pm }, \end {array}\right . \] where $a^{\pm }$ are local minima of the potential $W \in C_{\textrm {loc}}^2(\mathbb {R}^N)$ with $W(a^-)< W(a^+)=0$ and $N \geq 1$. Our method is variational and based on the minimization of the functional $E_c (U) = \int _{\mathbb {R}}\Big \{ \frac {1}{2}|U_x|^2 + W( U ) \Big \}e^{cx} dx$ in the appropriate space setup. Following Alikakos and Fusco (2008), we introduce an artificial constraint to restore compactness and force the desired asymptotic behavior, which we later remove. We provide variational characterizations of the travelling wave and the speed.References
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Additional Information
- Nicholas D. Alikakos
- Affiliation: Department of Mathematics, University of Athens, Panepistimioupolis 11584, Athens, Greece – and – Institute of Applied and Computational Mathematics, Foundation for Research and Technology, GR 70013 Heraklion, Crete, Greece
- Email: nalikako@math.uoa.gr
- Nikolaos I. Katzourakis
- Affiliation: Department of Mathematics, University of Athens, Panepistimioupolis 11584, Athens, Greece
- Email: nkatzourakis@math.uoa.gr
- Received by editor(s): December 24, 2007
- Received by editor(s) in revised form: November 30, 2008
- Published electronically: October 22, 2010
- Additional Notes: The first author was partially supported by Kapodistrias Grant No. 70/4/5622 at the University of Athens.
- © Copyright 2010
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication. - Journal: Trans. Amer. Math. Soc. 363 (2011), 1365-1397
- MSC (2010): Primary 35C07
- DOI: https://doi.org/10.1090/S0002-9947-2010-04987-6
- MathSciNet review: 2737269