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arXiv 1706.02005math.CA
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关于Heisenberg群的Young不等式

On Young's inequality for Heisenberg groups

Michael Christ

摘要:

杨氏卷积不等式提供了函数在$L^p$范数下的卷积的上界。已知对于某些群,包括海森堡群,这个不等式中的最优常数等于相同拓扑维数的欧几里得空间的最优常数,但不存在极值函数。对于海森堡群,我们刻画了几乎使不等式极值化的函数的有序三元组。分析依赖于某类函数方程的近似解的特征。这种类型的结果开发一类这样的方程。

英文摘要:

Young's convolution inequality provides an upper bound for the convolution of functions in terms of $L^p$ norms. It is known that for certain groups, including Heisenberg groups, the optimal constant in this inequality is equal to that for Euclidean space of the same topological dimension, yet no extremizing functions exist. For Heisenberg groups we characterize ordered triples of functions that nearly extremize the inequality. The analysis relies on a characterization of approximate solutions of a certain class of functional equations. A result of this type is developed for a class of such equations.

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