Existence and nonexistence of extremals for critical Adams inequalities in R4 and Trudinger-Moser inequalities in R2
Existence and nonexistence of extremals for critical Adams inequalities in R4 and Trudinger-Moser inequalities in R2
复制标题
R4 中临界 Adams 不等式和 R2 中 Trudinger-Moser 不等式的极值存在和不存在
DOI:
10.1016/j.aim.2020.107143
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发表时间:
2018-12
期刊:
影响因子:
--
通讯作者:
Maochun Zhu
中科院分区:
文献类型:
--
作者:
Lu Chen;Guozhen Lu;Maochun Zhu
Though much progress has been made with respect to the existence of extremals of the critical first order Trudinger-Moser inequalities in W 1, n (R n) and higher order Adams inequalities on finite domain Ω⊂ R n, whether there exists an extremal function for the critical higher order Adams inequalities on the entire space R n still remains open. The current paper represents the first attempt in this direction by considering the critical second order Adams inequality in the entire space R 4. The classical blow-up procedure cannot apply to solving the existence of critical Adams type inequality because of the absence of the Pólya-Szegö type inequality. In this paper, we develop some new ideas and approaches based on a sharp Fourier rearrangement principle (see [31]), sharp constants of the higher-order Gagliardo-Nirenberg inequalities and optimal poly-harmonic truncations to study the existence and nonexistence of the maximizers for the Adams inequalities in R 4 of the form S (α)= sup‖ u‖ H 2= 1∫ R 4 (exp(32 π 2| u| 2)− 1− α| u| 2) d x, where α∈(−∞, 32 π 2). We establish the existence of the threshold α⁎, where α⁎≥(32 π 2) 2 B 2 2 and B 2≥ 1 24 π 2, such that S (α) is attained if 32 π 2− α< α⁎, and is not attained if 32 π 2− α> α⁎. This phenomenon has not been observed before even in the case of first order Trudinger-Moser inequality. Therefore, we also establish the existence and non-existence of an extremal function for the Trudinger-Moser inequality on R 2. Furthermore, the symmetry of the extremal functions can also be deduced through the Fourier rearrangement principle.
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DOI:
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期刊:
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