Re-expansions on compact Lie groups
Re-expansions on compact Lie groups
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DOI:
10.1007/s13324-020-00376-1
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发表时间:
2020
影响因子:
1.7
通讯作者:
Akylzhanov R
中科院分区:
文献类型:
--
作者:
Akylzhanov R
In this paper we refine the re-expansion problems for the one-dimensional torus and extend them to the multidimensional tori and to compact Lie groups. First, we establish weighted versions of classical re-expansion results in the setting of multi-dimensional tori. A natural extension of the classical re-expansion problem to general compact Lie groups can be formulated as follows: given a function on the maximal torus of a compact Lie group, what conditions on its (toroidal) Fourier coefficients are sufficient in order to have that the group Fourier coefficients of its central extension are summable. We derive the necessary and sufficient conditions for the above property to hold in terms of the root system of the group. Consequently, we show how this problem leads to the re-expansions of even/odd functions on compact Lie groups, giving a necessary and sufficient condition in terms of the discrete Hilbert transform and the root system. In the model case of the groupa simple sufficient condition is given.
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DOI:
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发表时间:
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