Chromatic expansion with Bessel operator of fractional order

Abstract: This paper develops a Bessel-chromatic expansion framework associated with fractional powers of the Bessel-Laplace operator. The construction combines methods of weighted polynomial approximation and of fractional differential operators. Using the spectral representation of $(-Δ_a)^{\frac{1}{2}}$, we define Bessel-chromatic derivatives and apply them to weighted spherical means both at a general point and at the origin. Different classes of weights on finite and infinite intervals are considered, with particular attention to cases where the inverse Hankel transform is explicit. The convergence of the expansions is studied through Cesàro and de la Vallée Poussin means. In the bandlimited case, the method gives reconstruction formulas for weighted spherical means and, under suitable assumptions, recovery formulas for the original function. Numerical examples illustrate the decay of the Bessel-chromatic coefficients and the accuracy of the corresponding reconstructions.