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International Journal of Mathematics and Mathematical Sciences
Volume 2004, Issue 8, Pages 377-405

Asymptotics for critical nonconvective type equations

1Department of Mathematics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
2Departamento de Ciencias Básicas, Instituto Tecnológico de Morelia, Morelia, Michoacán CP 58120, Mexico
3Instituto de Matemáticas, Universidad Nacional Autonoma de México (UNAM), Campus Morelia, AP 61-3 (Xangari), Morelia, Michoacán CP 58089, Mexico

Received 18 March 2003

Copyright © 2004 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We study large-time asymptotic behavior of solutions to the Cauchy problem for a model of nonlinear dissipative evolution equation. The linear part is a pseudodifferential operator and the nonlinearity is a cubic pseudodifferential operator defined by means of the inverse Fourier transformation and represented by bilinear and trilinear forms with respect to the direct Fourier transform of the dependent variable. We consider nonconvective type nonlinearity, that is, we suppose that the total mass of the nonlinear term does not vanish. We consider the initial data, which have a nonzero total mass and belong to the weighted Sobolev space with a sufficiently small norm. Then we give the main term of the large-time asymptotics of solutions in the critical case. The time decay rate have an additional logarithmic correction in comparison with the corresponding linear case.