On Blow-up of Regular Solutions to the Isentropic Euler and Euler-Boltzmann Equations with Vacuum
Yue Cao , Yachun Li
Chinese Annals of Mathematics, Series B ›› 2021, Vol. 42 ›› Issue (4) : 495 -510.
On Blow-up of Regular Solutions to the Isentropic Euler and Euler-Boltzmann Equations with Vacuum
In this paper, the authors study the Cauchy problem of n-dimensional isentropic Euler equations and Euler-Boltzmann equations with vacuum in the whole space. They show that if the initial velocity satisfies some condition on the integral J in the “isolated mass group” (see (1.13)), then there will be finite time blow-up of regular solutions to the Euler system with J ≤ 0 (n ≥ 1) and to the Euler-Boltzmann system with J < 0 (n ≥ 1) and J = 0 (n ≥ 2), no matter how small and smooth the initial data are. It is worth mentioning that these blow-up results imply the following: The radiation is not strong enough to prevent the formation of singularities caused by the appearance of vacuum, with the only possible exception in the case J = 0 and n = 1 since the radiation behaves differently on this occasion.
Euler and Euler-Boltzmann equations / Finite time blow-up / Multidimensional / Regular solutions / Vacuum
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