Convergence and blow-up of solutions for a complex-valued heat equation with a quadratic nonlinearity

Guo, Jong-Shenq; Ninomiya, Hirokazu; Shimojo, Masahiko; Yanagida, Eiji

doi:10.1090/S0002-9947-2012-05797-7

Convergence and blow-up of solutions for a complex-valued heat equation with a quadratic nonlinearity
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by Jong-Shenq Guo, Hirokazu Ninomiya, Masahiko Shimojo and Eiji Yanagida PDF

Trans. Amer. Math. Soc. 365 (2013), 2447-2467 Request permission

Abstract:

This paper is concerned with the Cauchy problem for a system of parabolic equations which is derived from a complex-valued equation with a quadratic nonlinearity. First we show that if the convex hull of the image of initial data does not intersect the positive real axis, then the solution exists globally in time and converges to the trivial steady state. Next, on the one-dimensional space, we provide some solutions with nontrivial imaginary parts that blow up simultaneously. Finally, we consider the case of asymptotically constant initial data and show that, depending on the limit, the solution blows up nonsimultaneously at space infinity or exists globally in time and converges to the trivial steady state.

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