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A Gagliardo–Nirenberg Type Inequality for Rapidly Decaying Functions
Journal of Dynamics and Differential Equations ( IF 1.4 ) Pub Date : 2020-03-16 , DOI: 10.1007/s10884-020-09839-2
Marek Fila , Johannes Lankeit

We improve the Gagliardo–Nirenberg inequality

$$\begin{aligned} \Vert \varphi \Vert _{L^q({\mathbb {R}}^n)} \le C \Vert \nabla \varphi \Vert _{L^r({\mathbb {R}}^n)} {\mathcal {L}}^{-(\frac{1}{q} - \frac{n-2}{2n})} (\Vert \nabla \varphi \Vert _{L^r({\mathbb {R}}^n)}), \end{aligned}$$

\(r=2\), \(0<q<\frac{2n}{(n-2)_+}\), \({\mathcal {L}}\) generalizing \({\mathcal {L}}(s)=\ln ^{-1}\frac{2}{s}\) for \(0<s<1\), from Fila and Winkler (Adv Math 357, 2019. https://doi.org/10.1016/j.aim.2019.106823) for rapidly decaying functions (\(\varphi \in W^{1,2}({\mathbb {R}}^n){\setminus }\{0\}\) with finite \(K=\int _{{\mathbb {R}}^n} \mathcal {L}(|\varphi |)\)) by specifying the dependence of C on K and by allowing arbitrary \(r\ge 1\).



中文翻译:

快速衰变函数的Gagliardo-Nirenberg型不等式

我们改善了加利亚多-尼伦贝格不等式

$$ \ begin {aligned} \ Vert \ varphi \ Vert _ {L ^ q({\ mathbb {R}} ^ n)} \ le C \ Vert \ nabla \ varphi \ Vert _ {L ^ r({\ mathbb {R}} ^ n)} {\数学{L}} ^ {-(\ frac {1} {q}-\ frac {n-2} {2n})}}(\ Vert \ nabla \ varphi \ Vert _ {L ^ r({\ mathbb {R}} ^ n)}),\ end {aligned} $$

\(r = 2 \)\(0 <q <\ frac {2n} {(n-2)_ +} \)\({\ mathcal {L}} \)推广\({\ mathcal {L }}(s)= \ ln ^ {-1} \ frac {2} {s} \)\(0 <s <1 \),来自Fila和Winkler(Adv Math 357,2019. https:// doi .org / 10.1016 / j.aim.2019.106823)用于快速衰减的函数(\(\ varphi \ in W ^ {1,2}({\ mathbb {R}} ^ n){\ setminus} \ {0 \} \ ),通过指定CK的依赖关系并允许任意\(r )来使用有限\(K = \ int _ {{\ mathbb {R}} ^ n} \ mathcal {L}(| \ varphi |)\)\ ge 1 \)

更新日期:2020-04-18
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