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arXiv 1607.00154math.FAmath.CA
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双曲空间中Poincaré型不等式的Sharp常数

Sharp constant for Poincaré-type inequalities in the hyperbolic space

Quôc-Anh Ngô, Van Hoang Nguyen

摘要:

本文在双曲空间$\mathbb H^n$上建立了一个Poincaré型不等式,即对任何$u \in W^{m,p}(\mathbb H^n)$都成立\[ \|u\|_{p} \leqslant C(n,m,p) \|\nabla^m_g u\|_{p} \].我们证明了上述不等式的尖常数$C(n,m,p)$是\[ C(n,m,p) = \begin{cases} \left( p p'/(n-1)^2 \right)^{m/2}&\mbox{if $m$ is even},\\ (p/(n-1))\left( p p'/(n-1)^2\right)^{(m-1)/2} &\mbox{if $m$ is odd}, \end{cases} \],其中有$p' = p/(p-1)$,而这个尖常数在$W^{m,p}(\mathbb H^n)$中是不存在的.我们的证明依赖于推广到双曲空间的对称化方法。

英文摘要:

In this note, we establish a Poincaré-type inequality on the hyperbolic space $\mathbb H^n$, namely \[ \|u\|_{p} \leqslant C(n,m,p) \|\nabla^m_g u\|_{p} \] for any $u \in W^{m,p}(\mathbb H^n)$. We prove that the sharp constant $C(n,m,p)$ for the above inequality is \[ C(n,m,p) = \begin{cases} \left( p p'/(n-1)^2 \right)^{m/2}&\mbox{if $m$ is even},\\ (p/(n-1))\left( p p'/(n-1)^2\right)^{(m-1)/2} &\mbox{if $m$ is odd}, \end{cases} \] with $p' = p/(p-1)$ and this sharp constant is never achieved in $W^{m,p}(\mathbb H^n)$. Our proofs rely on the symmetrization method extended to hyperbolic spaces.

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