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arXiv 2006.14522math.APmath.CAmath.PR
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二维Laplace-Beltrami算子的乘积公式和卷积:超越平凡情形

Product formulas and convolutions for two-dimensional Laplace-Beltrami operators: beyond the trivial case

Rúben Sousa, Manuel Guerra, Semyon Yakubovich

摘要:

引入了与给定椭圆型偏微分算子相关联的卷积算子族的概念。这样的卷积结构是存在的拉普拉斯-贝尔特拉米算子的一般类赋予锥状度量的二维流形。这种结构产生了一个卷积半群表示的马尔可夫半群所产生的拉普拉斯-贝尔特拉米算子。在算子$\mathcal{L} = \partial_x^2 + {1 \over 2x} \partial_x + {1 \over x} \partial_θ^2$在$\mathbb{R}^+ \times \mathbb{T}$上的特殊情况下,我们推导出二维积分变换的卷积结构的存在性,其核和反演公式可以用汇合型超几何函数的封闭形式表示.本文的结果可以解释为一维广义卷积理论到多参数本征值问题框架的自然扩张。

英文摘要:

We introduce the notion of a family of convolution operators associated with a given elliptic partial differential operator. Such a convolution structure is shown to exist for a general class of Laplace-Beltrami operators on two-dimensional manifolds endowed with cone-like metrics. This structure gives rise to a convolution semigroup representation for the Markovian semigroup generated by the Laplace-Beltrami operator. In the particular case of the operator $\mathcal{L} = \partial_x^2 + {1 \over 2x} \partial_x + {1 \over x} \partial_θ^2$ on $\mathbb{R}^+ \times \mathbb{T}$, we deduce the existence of a convolution structure for a two-dimensional integral transform whose kernel and inversion formula can be written in closed form in terms of confluent hypergeometric functions. The results of this paper can be interpreted as a natural extension of the theory of one-dimensional generalized convolutions to the framework of multiparameter eigenvalue problems.

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