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arXiv 2209.05083math.APmath.CA
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黎曼流形上里斯变换的逆不等式

Reverse inequality for the riesz transforms on Riemannian manifolds

Emmanuel Russ, Baptiste Devyver

摘要:

设$M$是一个完备的黎曼流形,它满足测地球的体积加倍条件,并且对于某些$q<2$,满足合适的远球上的$L^q$标度Poincaré不等式.我们证明了不等式$\left\Vert Δ^{1/2}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$对所有的$p\in (q,2]$,推广了以前的结果由于Auscher和Coulhon。我们的结论特别适用于当$M$有有限个欧几里得端点时。证明强烈依赖于哈代不等式,这也是新的,在这种情况下,独立的利益。这项工作的第二部分涉及类似问题的分形电缆系统。在这个框架下,Chen,Coulhon,Feneuil和第二作者已经证明了,在Vicsek电缆系统中,不等式$\left\Vert Δ^{1/2}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$对所有$p\in [1,2)$都可能为假.根据最近的一项联合工作,由两位作者和杨,我们研究的有效性不等式的形式$\left\Vert Δ^γe^{-Δ}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$。在Vicsek的情况下,我们给出了$p$的最优范围,使这个不等式成立。

英文摘要:

Let $M$ be a complete Riemannian manifold satisfying the doubling volume condition for geodesic balls and $L^q$ scaled Poincaré inequalities on suitable remote balls for some $q<2$. We prove the inequality $\left\Vert Δ^{1/2}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$ for all $p\in (q,2]$, which generalizes previous results due to Auscher and Coulhon. Our conclusion applies, in particular, when $M$ has a finite number of Euclidean ends. The proof strongly relies on Hardy inequalities, which are also new in this context and of independent interest. The second part of this work deals with analogous questions in fractal-like cable systems. In this framework, it was already proved by Chen, Coulhon, Feneuil and the second author that, in the Vicsek cable system, the inequality $\left\Vert Δ^{1/2}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$ may be false for all $p\in [1,2)$. Following a recent joint work by the two authors and Yang, we examine the validity of inequalities of the form $\left\Vert Δ^γe^{-Δ}f\right\Vert_p\lesssim \left\Vert \nabla f\right\Vert_p$. In the Vicsek case, we give the optimal range of $p$ for which this inequality holds.

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