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arXiv 1201.2907math.AP
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四维能量临界半线性Heat Equation的II型爆破

Type II Blow Up for the Four Dimensional Energy Critical Semi Linear Heat Equation

Rémi Schweyer

摘要:

考虑能量临界的四维半线性热方程\partial tu- \Deltau -u 3 = 0.我们证明了II型有限时间爆破解的存在性,并给出了相应的奇异性形成的尖锐的描述。这些解在$\dot{H}^1$中的临界拓扑u(t,r)-1/λ Q(r/λ)\rightarrow u* 中集中了一个普遍的能量泡,其中爆破轮廓由Talenti Aubin孤子Q(r)= 1/(1 +r^2/8)给出,速度为λ(t)~(T-t)/|log(T-t)|^2作为t \rightarrowT。我们的方法使用了一个鲁棒的能量方法的方法开发的几何色散问题的研究,并在于能量临界谐波热流和能量临界四维波动方程的研究的延续。

英文摘要:

We consider the energy critical four dimensional semi linear heat equation \partial tu-\Deltau-u3 = 0. We show the existence of type II finite time blow up solutions and give a sharp description of the corresponding singularity formation. These solutions concentrate a universal bubble of energy in the critical topology u(t,r)-1/λ Q(r/λ)\rightarrow u* in $\dot{H}^1$ where the blow up profile is given by the Talenti Aubin soliton Q(r)= 1/(1 +r^2/8) and with speed λ(t) ~(T-t)/|log(T - t)|^2 as t\rightarrowT. Our approach uses a robust energy method approach developped for the study of geometrical dispersive problems, and lies in the continuation of the study of the energy critical harmonic heat flow and the energy critical four dimensional wave equation.

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