Real Paley-Wiener theorems and local spectral radius formulas

Abstract

We systematically develop real Paley-Wiener theory for the Fourier transform on R^d for Schwartz functions, L^p-functions and distributions, in an elementary treatment based on the inversion theorem. As an application, we show how versions of classical Paley-Wiener theorems can be derived from the real ones via an approach which does not involve domain shifting and which may be put to good use for other transforms of Fourier type as well. An explanation is also given why the easily applied classical Paley-Wiener theorems are unlikely to be able to yield information about the support of a function or distribution which is more precise than giving its convex hull, whereas real Paley-Wiener theorems can be used to reconstruct the support precisely, albeit at the cost of combinatorial complexity. We indicate a possible application of real Paley-Wiener theory to partial differential equations in this vein and furthermore we give evidence that a number of real Paley-Wiener results can be expected to have an interpretation as local spectral radius formulas. A comprehensive overview of the literature on real Paley-Wiener theory is included.

27 pages, no figures. Reference updated. Final version, to appear in Trans. Amer. Math. Soc

References in corpus (4)

• Paley-Wiener theorems for the Dunkl transform
• Elementary proofs of Paley-Wiener theorems for the Dunkl transform on the real line
• Deconvolution of band limited functions on non-compact symmetric spaces
• Local spectral radius formulas on compact Lie groups

Cited by in corpus (9)

• Real Paley-Wiener theorems in spaces of ultradifferentiable functions
• Bernstein Spaces on Siegel CR Manifolds
• Nonlocal elliptic equation in Hölder space and the martingale problem
• Local spectral radius formulas on compact Lie groups
• A fresh approach to the Paley-Wiener theorem for Mellin transforms and the Mellin-Hardy spaces
• Function with its Fourier transform supported on annulus and eigenfunction of Laplacian
• Paley--Wiener Theorems for the U(n)--spherical transform on the Heisenberg group
• On the Paley-Wiener theorem in the Mellin transform setting
• Local spectral radius formulas for a class of unbounded operators on Banach spaces