On the Connection Between the Fueter-Sce-Qian Theorem and the Generalized CK-Extension

The Fueter-Sce-Qian theorem provides a way of inducing axial monogenic functions in Rm+1 from holomorphic intrinsic functions of one complex variable. This result was initially proved by Fueter and Sce for the cases where the dimension m is odd using pointwise differentiation, while the extension to the cases where m is even was proved by Qian using the corresponding Fourier multipliers. In this paper, we provide an alternative description of the Fueter-Sce-Qian theorem in terms of the generalized CK-extension. The latter characterizes axial null solutions of the Cauchy-Riemann operator in Rm+1 in terms of their restrictions to the real line. This leads to a one-to-one correspondence between the space of axially monogenic functions in Rm+1 and the space of analytic functions of one real variable. We provide explicit expressions for the Fueter-Sce- Qian map in terms of the generalized CK-extension for both cases, m even and m odd. These expressions allow for a plane wave decomposition of the Fueter-Sce-Qian map or, more in particular, a factorization of this mapping in terms of the dual Radon transform. In turn, this decomposition provides a new possibility for extending the Coherent State Transform (CST) to Clifford Analysis. In particular, we construct an axial CST defined through the Fueter-Sce-Qian mapping, and show how it is related to the axial and slice CST's already studied in the literature.