Blow up for the critical gKdV equation III: exotic regimes

Yvan Martel (1, 2) , Frank Merle (3, 4) , Pierre Raphaël (5)

1 LMV - Laboratoire de Mathématiques de Versailles
2 CMLS - Centre de Mathématiques Laurent Schwartz
3 AGM - UMR 8088 - Analyse, Géométrie et Modélisation
4 IHES - Institut des Hautes Études Scientifiques
5 IMT - Institut de Mathématiques de Toulouse UMR5219

We consider the blow up problem in the energy space for the critical (gKdV) equation in the continuation of part I and part II. We know from part I that the unique and stable blow up rate for solutions close to the solitons with strong decay on the right is $1/t$. In this paper, we construct non-generic blow up regimes in the energy space by considering initial data with explicit slow decay on the right in space. We obtain finite time blow up solutions with speed $t^{-\nu}$ where $ \nu>11/13,$ as well as global in time growing up solutions with both exponential growth or power growth. These solutions can be taken with initial data arbitrarily close to the ground state solitary wave.

Domaines: Equations aux dérivées partielles [math.AP]

Yvan Martel, Frank Merle, Pierre Raphaël. Blow up for the critical gKdV equation III: exotic regimes. Annali della Scuola Normale Superiore di Pisa, 2015, XIV, pp.575-631. ⟨hal-00843250⟩