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arXiv 1709.04201math.AP
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抛物-椭圆型Keller-Segel方程组中JKO格式的L^ $\infty$估计

L^$\infty$ estimates for the jko scheme in parabolic-elliptic keller-segel systems

José-Antonio Carrillo, Filippo Santambrogio

摘要:

对于一般形式的抛物椭圆型Keller-Segel型系统,在任意维数下,利用JKO方法,证明了关于密度的L^ $\infty$估计.当然,这样的估计在有限时间内爆炸,该时间与初始L^ $\infty$范数的倒数成比例。这个估计可以用来证明这种形式的一些方程的短期适定性,而不管初始数据的质量。构造的解的存在时间与特征线方法得到的不含扩散项的拉格朗日解的最大存在时间一致。

英文摘要:

We prove L^$\infty$ estimates on the densities that are obtained via the JKO scheme for a general form of a parabolic-elliptic Keller-Segel type system, with arbitrary diffusion, arbitrary mass, and in arbitrary dimension. Of course, such an estimate blows up in finite time, a time proportional to the inverse of the initial L^$\infty$ norm. This estimate can be used to prove short-time well-posedness for a number of equations of this form regardless of the mass of the initial data. The time of existence of the constructed solutions coincides with the maximal time of existence of Lagrangian solutions without the diffusive term by characteristic methods.

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