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The Riesz Transform and Fractional Integral Operators in the Bessel Setting (2303.07952v1)
Published 14 Mar 2023 in math.CA and math.FA
Abstract: Fix $\lambda>0$. Consider the Bessel operator $\triangle_\lambda:=-\frac{d2}{dx2}-\frac{2\lambda}{x} \frac d{dx}$ on $\mathbb{R_+}$, where $\mathbb{R_+}:=(0,\infty)$ and $dm_\lambda:=x{2\lambda}dx$ with $dx$ the Lebesgue measure. We provide a deeper study of the Bessel Riesz transform and fractional integral operator via the related Besov and Triebel--Lizorkin spaces associated with $\triangle_\lambda$. Moreover, we investigate some possible characterization of the commutator of fractional integral operator, which was missing in the literature of the Bessel setting.