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arXiv 1311.0367math.AP
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二重度量测度空间上点态热核上界的一种新方法

A new approach to pointwise heat kernel upper bounds on doubling metric measure spaces

Salahaddine Boutayeb, Thierry Coulhon, Adam Sikora

摘要:

在具有强局部正则Dirichlet型的双重度量测度空间上,利用整体标度不变不等式给出了热核的逐点上界的一些特征,当体积增长为多项式时,这些特征分别对应于Nash不等式和Gagliardo-Nirenberg型不等式.这产生了一个新的证明和推广的经典热核上界和相对Faber-Krahn不等式或本地化Sobolev或纳什不等式之间的著名的等价性。我们能够处理更一般的逐点估计,热核衰变率不一定由体积增长。一个至关重要的作用是由有限的传播速度属性相关联的波动方程,我们的主要结果保持一个抽象的算子半群满足Davies-Gaffney估计。

英文摘要:

On doubling metric measure spaces endowed with a strongly local regular Dirichlet form, we show some characterisations of pointwise upper bounds of the heat kernel in terms of global scale-invariant inequalities that correspond respectively to the Nash inequality and to a Gagliardo-Nirenberg type inequality when the volume growth is polynomial. This yields a new proof and a generalisation of the well-known equivalence between classical heat kernel upper bounds and relative Faber-Krahn inequalities or localized Sobolev or Nash inequalities. We are able to treat more general pointwise estimates, where the heat kernel rate of decay is not necessarily governed by the volume growth. A crucial role is played by the finite propagation speed property for the associated wave equation, and our main result holds for an abstract semigroup of operators satisfying the Davies-Gaffney estimates.

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