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# Remarks on the Cauchy problem for the one-dimensional quadratic (fractional) heat equation

Abstract : We prove that the Cauchy problem associated with the one dimensional quadratic (fractional) heat equation: $u_t=D_x^{2\alpha} u \mp u^2,\; t\in (0,T),\; x\in \R$ or $\T$, with $0<\alpha\le 1$ is well-posed in $H^s$ for $s\ge \max(-\alpha,1/2-2\alpha)$ except in the case $\alpha=1/2$ where it is shown to be well-posed for $s>-1/2$ and ill-posed for $s=-1/2$. As a by-product we improve the known well-posedness results for the heat equation ($\alpha=1$) by reaching the end-point Sobolev index $s=-1$. Finally, in the case $1/2<\alpha\le 1$, we also prove optimal results in the Besov spaces $B^{s,q}_2.$
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Journal articles

Cited literature [19 references]

https://hal.archives-ouvertes.fr/hal-00807047
Contributor : Luc Molinet Connect in order to contact the contributor
Submitted on : Tuesday, April 2, 2013 - 7:00:58 PM
Last modification on : Tuesday, January 11, 2022 - 5:56:07 PM
Long-term archiving on: : Sunday, April 2, 2017 - 11:31:19 PM

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Molinet-Tayachi-2-4-2013.pdf
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### Identifiers

• HAL Id : hal-00807047, version 1
• ARXIV : 1304.0880

### Citation

Luc Molinet, Slim Tayachi. Remarks on the Cauchy problem for the one-dimensional quadratic (fractional) heat equation. Journal of Functional Analysis, Elsevier, 2015, 269, pp.2305-2327. ⟨hal-00807047⟩

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