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Small data solutions for the Euler-Poisson-Darboux equation with a power nonlinearity
Journal of Differential Equations ( IF 2.4 ) Pub Date : 2021-03-23 , DOI: 10.1016/j.jde.2021.03.033
Marcello D'Abbicco

We study the Cauchy problem for the Euler-Poisson-Darboux equation, with a power nonlinearity:uttuxx+μtut=tα|u|p,t>t0,xR, where μ>0, p>1 and α>2. Here either t0=0 (singular problem) or t0>0 (regular problem). We show that this model may be interpreted as a semilinear wave equation with borderline dissipation: the existence of global small data solutions depends not only on the power p, but also on the parameter μ. Global small data weak solutions exist if(p1)min{1,μ,μ2+1p}>2+α. In the case of α=0, the above condition is equivalent to p>pcrit=max{pStr(1+μ),3}, where pStr(k) is the critical exponent conjectured by W.A. Strauss for the semilinear wave equation without dissipation (i.e. μ=0) in space dimension k. Varying the parameter μ, there is a continuous transition from pcrit= (for μ=0) to pcrit=3 (for μ4/3). The optimality of pcrit follows by known nonexistence counterpart results for 1<ppcrit (and for any p>1 if μ=0).

As a corollary of our result, we obtain analogous results for generalized semilinear Tricomi equations and other models related to the Euler-Poisson-Darboux equation.



中文翻译:

具有功率非线性的Euler-Poisson-Darboux方程的小数据解决方案

我们研究具有幂非线性的Euler-Poisson-Darboux方程的柯西问题:üŤŤ-üXX+μŤüŤ=Ťα|ü|pŤ>Ť0X[R 在哪里 μ>0p>1个α>-2个。在这里Ť0=0 (单个问题)或 Ť0>0(常规问题)。我们表明,该模型可以解释为具有边界耗散的半线性波动方程:全局小数据解的存在不仅取决于幂p,而且取决于参数μ。如果存在全球小数据弱解决方案p-1个{1个μμ2个+1个p}>2个+α 如果是 α=0,上述条件等同于 p>p暴击=最大限度{p力量1个+μ3}, 在哪里 p力量ķ 是WA Strauss猜想的无耗散半线性波动方程的临界指数(即 μ=0)在空间尺寸k中。改变参数μ,从p暴击= (为了 μ=0) 到 p暴击=3 (为了 μ4/3)。的最优性p暴击 接着是已知的不存在的对应结果 1个<pp暴击 (以及任何 p>1个 如果 μ=0)。

作为结果的推论,我们获得了广义半线性Tricomi方程和与Euler-Poisson-Darboux方程有关的其他模型的相似结果。

更新日期:2021-03-24
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