Finite time blow-up of complex solutions of the conserved Kuramoto–Sivashinsky equation in ℝd and in the torus 𝕋d, d ⩾ 1. Issue 5 (October 2019)

• Record Type: Journal Article
• Authors: Agélas, Léo
• Is Part Of: Proceedings. Volume 149:Issue 5(2019)
• Page Start: 1175
• Page End: 1188
• Publication Date: 2019-10
• Subjects: Blow up, -- Surface growth, -- conserved Kuramoto–Sivashinsky; Mathematics -- Periodicals; 510
• DOI: 10.1017/prm.2018.54
• Languages: English
• ISSNs: 0308-2105

Abstract

Abstract: We consider complex-valued solutions of the conserved Kuramoto–Sivashinsky equation which describes the coarsening of an unstable solid surface that conserves mass and that is parity symmetric. This equation arises in different aspects of surface growth. Up to now, the problem of existence and smoothness of global solutions of such equations remained open in ℝ d and in the torus 𝕋 d, d ⩾ 1. In this paper, we answer partially to this question. We prove the finite time blow-up of complex-valued solutions associated with a class of large initial data. More precisely, we show that there is complex-valued initial data that exists in every Besov space (and hence in every Lebesgue and Sobolev space), such that after a finite time, the complex-valued solution is in no Besov space (and hence in no Lebesgue or Sobolev space).