Star-products, spectral analysis, and hyperfunctions

Star-products, spectral analysis, and hyperfunctions
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明星产品、光谱分析和超函数

DOI:
10.1007/978-94-015-1276-3_16
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发表时间:
2000
期刊:
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影响因子:
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通讯作者:
José Silva
José Silva
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文献类型:
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作者:
Carlos Moreno;José Silva

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我们研究了在辛流形(t × t; ω)上的矩阵-积的仿射辛李代数中任意元素X的-指数函数U(t;X)。当X是紧化元素时,我们在非紧化情况下的研究提出了U (t;X)作为指数函数的一个自然的特定候选者。U (t;X)在变量上有奇点。解析延拓U(z;X),z = t + iy,定义了两个边界值δ+U (t;X) = limy↓0U(z;X)和δ-(t;X) = limy↑0U(z; X), δ+U (t;X)是一个分布,δ-U (t;X)是一个beurling型,gevrey类s - 2超分布。我们计算t中的傅里叶变换δ±U (t;X)两种傅立叶谱都是离散的,但不同(例如,谐振子的符号相反)。δ+U(t;X)的傅里叶谱与希尔伯特空间2(X)中Weyl符号为X的自伴随算子的谱相吻合,只有边值δ+U(t;X)可以被认为是元素X的-指数函数,因为δ-U(t;X)在希尔伯特空间2(X)中没有解释。
We study the ⋆-exponential function U(t;X) of any element X in the affine symplectic Lie algebra of the Moyal ⋆-product on the symplectic manifold (ℝ × ℝ;ω). When X is a compact element, a natural specific candidate for U (t;X) to be the exponential function is suggested by the study we make in the non-compact case. U (t;X) has singularities in thetvariable. The analytic continuation U(z;X),z = t + iy, defines two boundary values δ+U (t;X) = limy↓0U(z;X) and δ-(t;X) = limy↑0U(z; X). δ+U (t;X) is a distribution while δ-U (t;X) is a Beurling-type, Gevrey-class s — 2 ultradistribution. We compute the Fourier transforms in t of δ±U (t;X). Both Fourier spectra are discrete but different (e.g. opposite in sign for the harmonic oscillator). The Fourier spectrum of δ+U(t;X) coincides with the spectrum of the self adjoint operator in the Hilbert spaceL2(ℝ) whose Weyl symbol is X. Only the boundary value δ+U(t;X) should be considered as the ⋆-exponential function for the elementX, since δ-U(t;X) has no interpretation in the Hilbert spaceL2(ℝ).