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arXiv 1111.1580math.APmath-phmath.MP
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完全抛物拟线性一维Keller-Segel系统是否具有类似于抛物椭圆简化的长时间渐近性?

Does the fully parabolic quasilinear 1D Keller-Segel system enjoy long-time asymptotics analogous to its parabolic-elliptic simplification?

Jan Burczak, Tomasz Cieślak, Cristian Morales-Rodrigo

摘要:

我们证明了具有非线性扩散的一维完全抛物型Keller-Segel方程组具有整体时间解,条件是非线性扩散等于(1+u)^{-α},其中α< 1,与初始数据的体积无关.我们还表明,在临界情况下,即α= 1时,对于初始质量小于一个预定常数,同样的结果也成立。此外,我们证明了存在的初始数据,解决方案在有限时间内爆炸的任何非线性扩散可积在无穷远。从而将已知的抛物-椭圆情形的爆破结果推广到完全抛物情形。然而,在抛物-椭圆情形下,上述关于非线性扩散的可积性条件明显区别于整体存在和爆破情形。在完全抛物情形下,我们无法恢复这个结果的整个全局存在对应。

英文摘要:

We show that the one-dimensional fully parabolic Keller-Segel system with nonlinear diffusion possesses global-in-time solutions, provided the nonlinear diffusion is equal to (1+u)^{-α}, for α< 1, independently on the volume of the initial data. We also show that in the critical case, i.e. for α= 1, the same result holds for initial masses smaller than a prescribed constant. Additionally, we prove existence of initial data for which solution blows up in a finite time for any nonlinear diffusion integrable at infinity. Thus we generalize the known blowup result of parabolic-elliptic case to the fully parabolic one. However, in the parabolic-elliptic case the above mentioned integrability condition on nonlinear diffusion sharply distinguishes between global existence and blowup cases. We are unable to recover the entire global existence counterpart of this result in a fully parabolic case.

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