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arXiv 1409.6201math.CA
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关于广义Lebedev指标变换

On the generalized Lebedev index transform

Semyon Yakubovich

摘要:

研究了Macdonald函数平方的Lebedev指数变换的一个本质推广。也就是说,我们考虑一族具有正核$|K_{(iτ+α)/2}(x)|^2, α\ge 0,\ x >0, \ τ\in \mathbb{R},$的积分算子,其中$K_μ(z)$是Macdonald函数,$ i$是虚数单位。在Lebesgue加权空间中研究了这些算子及其伴随的映射性质,如有界性、紧性、可逆性等。证明了反演定理。重要的特殊情况下展出。作为一个有趣的应用,得到了含有拉普拉斯算子的二阶微分差分方程的初值问题的一个解。

英文摘要:

An essential generalization of the Lebedev index transform with the square of the Macdonald function is investigated. Namely, we consider a family of integral operators with the positive kernel $|K_{(iτ+α)/2}(x)|^2, α\ge 0,\ x >0, \ τ\in \mathbb{R},$ where $K_μ(z)$ is the Macdonald function and $ i$ is the imaginary unit. Mapping properties such as the boundedness, compactness, invertibility are investigated for these operators and their adjoints in the Lebesgue weighted spaces. Inversion theorems are proved. Important particular cases are exhibited. As an interesting application, a solution of the initial value problem for the second order differential difference equation, involving the Laplacian, is obtained.

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