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arXiv · 2610.19332

Nondegeneracy and asymptotic behavior of type I blow-up for semilinear heat equations with general nonlinearities

Yohei Fujishima·Ryoto Ichiya·Norisuke Ioku
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Abstract

We study the local asymptotic behavior of nonnegative type I blow-up solutions to semilinear heat equations with nonlinearities that need not be scale invariant. Using a quasi-similarity transformation adapted to the associated ordinary differential equation, we establish locally uniform convergence to a constant profile on the parabolic spatial scale near every interior blow-up point. Under a quantitative assumption on the nonlinearity at infinity, our results cover regularly varying nonlinearities in the Sobolev subcritical and critical ranges and, in one and two space dimensions, rapidly growing nonlinearities including double exponentials. A key ingredient in this analysis is a positive lower bound for the normalized solution at interior blow-up points. In fact, under weaker assumptions on the nonlinearity, we prove this bound in arbitrary space dimension without assuming radial symmetry.

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Yohei Fujishima, Ryoto Ichiya, Norisuke Ioku. 2026-10-14. Nondegeneracy and asymptotic behavior of type I blow-up for semilinear heat equations with general nonlinearities. https://arxiv.org/abs/2610.19332

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