A conditional Fourier-Feynman transform and conditional convolution product with change of scales on a function space. II
Summary: Using a simple formula for conditional expectations over continuous paths, we will evaluate conditional expectations which are types of analytic conditional Fourier-Feynman transforms and conditional convolution products of generalized cylinder functions and the functions in a Banach algebra which is the space of generalized Fourier transforms of the measures on the Borel class of \(L_2 [0, T]\). We will then investigate their relationships. Particularly, we prove that the conditional transform of the conditional convolution product can be expressed by the product of the conditional transforms of each function. Finally we will establish change of scale formulas for the conditional transforms and the conditional convolution products. In these evaluation formulas and change of scale formulas, we use multivariate normal distributions so that the conditioning function does not contain present positions of the paths. For Part I, see [the author, Bull. Korean Math. Soc. 54, No. 2, 687--704 (2017; Zbl 1388.43003)].
scientific article; zbMATH DE number 6917560