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arXiv 1602.08319math.AP
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加权快速扩散方程(I):Caffarelli-Kohn-Nirenberg不等式中不带对称性和对称破缺的锐渐近速率

Weighted fast diffusion equations (Part I): Sharp asymptotic rates without symmetry and symmetry breaking in Caffarelli-Kohn-Nirenberg inequalities

Matteo Bonforte, Jean Dolbeault, Matteo Muratori, Bruno Nazaret

摘要:

本文考虑了一类Caffarelli-Kohn-Nirenberg插值不等式(CKN),其权和指数均为两个径向幂律,且均在次临界范围内.我们解决对称性破缺的问题:最佳功能径向对称,或没有?我们的直觉来自于加权快速扩散(WFD)流:如果对称性成立,则控制中间渐近性的显式熵-熵产生不等式确实等价于(CKN),并且自相似轮廓对于(CKN)是最优的。我们通过证明(CKN)的径向最优函数的线性不稳定性,建立了一个明确的对称破缺条件。对称性破缺(CKN)也对熵-熵产生不等式和(WFD)的中间渐近性有影响。即使在(CKN)中不存在对称性,(WFD)解的渐近收敛速度也由一个加权Hardy-Poincar不等式决定,该不等式被解释为一个线性化的熵-熵产生不等式.我们所有的结果依赖于研究的自相似配置文件,这是相当于(CKN)周围的径向最优函数的线性化的线性化扩散算子的频谱的底部,和变分方法。(WFD)流的后果将在本工作的第二部分进行研究。

英文摘要:

In this paper we consider a family of Caffarelli-Kohn-Nirenberg interpolation inequalities (CKN), with two radial power law weights and exponents in a subcritical range. We address the question of symmetry breaking: are the optimal functions radially symmetric, or not ? Our intuition comes from a weighted fast diffusion (WFD) flow: if symmetry holds, then an explicit entropy - entropy production inequality which governs the intermediate asymptotics is indeed equivalent to (CKN), and the self-similar profiles are optimal for (CKN). We establish an explicit symmetry breaking condition by proving the linear instability of the radial optimal functions for (CKN). Symmetry breaking in (CKN) also has consequences on entropy - entropy production inequalities and on the intermediate asymptotics for (WFD). Even when no symmetry holds in (CKN), asymptotic rates of convergence of the solutions to (WFD) are determined by a weighted Hardy-Poincar{é} inequality which is interpreted as a linearized entropy - entropy production inequality. All our results rely on the study of the bottom of the spectrum of the linearized diffusion operator around the self-similar profiles, which is equivalent to the linearization of (CKN) around the radial optimal functions, and on variational methods. Consequences for the (WFD) flow will be studied in Part II of this work.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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