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Weak entropy solution for a Keller-Segel type fluid model

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arxiv 2108.04721 v1 pith:ACK3B5Y6 submitted 2021-08-10 math.AP

Weak entropy solution for a Keller-Segel type fluid model

classification math.AP
keywords massentropyweakcriticalfluidkeller-segelmodelsolution
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In this paper, we consider a Keller-Segel type fluid model, which is a kind of Euler-Poisson system with a self-gravitational force. We show that similar to the parabolic case, there is a critical mass $8\pi$ such that if the initial total mass $M$ is supercritical, i.e., $M> 8\pi$, then any weak entropy solution with the same mass $M$ must blow up in finite time. The a priori estimates of weak entropy solutions for critical mass $M=8\pi$ and subcritical mass $M<8\pi$ are also obtained.

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