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arXiv 1505.02440math.AP
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流形上的夏普Lp-熵不等式

Sharp Lp-entropy inequalities on manifolds

Jurandir Ceccon, Marcos Montenegro

摘要:

在2003年,Del Pino和Dolbeault [14]和Gentil [19]独立地研究了与p> 1的欧几里得Lp-熵不等式相关的最佳常数和极值。在这项工作中,我们提出了一些贡献的黎曼背景下。设(M,g)是n ≥ 3维的闭黎曼流形.当1 <p <= 2时,证明了锐黎曼Lp-熵不等式int_M |u| ^p log(|u| ^p)dv_g <= n/p log(A_{opt} int_M| Grad_g u| ^p dv_g + B)在所有函数u em H ^{1,p}(M)上使得||u||_{Lp(M)}= 1,对于某个常数B。证明了第一最佳常数A_{opt}与相应的欧氏常数相等。我们的方法是在Bakry,Coulhon,Ledoux和Sallof-Coste的思想[3]的启发下得到欧几里德熵不等式作为合适的次临界插值不等式的极限情况。证明了当p> 2时,该不等式有时不成立.

英文摘要:

In 2003, Del Pino and Dolbeault [14] and Gentil [19] investigated, independently, best constants and extremals associated to Euclidean Lp-entropy inequalities for p > 1. In this work, we present some contributions in the Riemannian context. Namely, let (M,g) be a closed Riemannian manifold of dimension n >= 3. For 1 < p <= 2, we establish the validity of the sharp Riemannian Lp-entropy inequality int_M |u|^p log(|u|^p) dv_g <= n/p log ( A_{opt} int_M |Grad_g u|^p dv_g + B ) on all functions u em H^{1,p}(M) such that ||u||_{Lp(M)} = 1 for some constant B. Moreover, we prove that the first best constant A_{opt} is equal to the corresponding Euclidean one. Our approach is inspired on the Bakry, Coulhon, Ledoux and Sallof-Coste's idea [3] of getting Euclidean entropy inequalities as a limit case of suitable subcritical interpolation inequalities. It is conjectured that the inequality sometimes fails for p > 2.

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