*Preprint*

**Inserted:** 22 jun 2017

**Last Updated:** 22 jun 2017

**Pages:** 17

**Year:** 2017

**Abstract:**

In this paper we study some boundary operators of a class of Bessel-type Littlewood-Paley extensions whose prototype is \[ \Delta_x u(x,y) +\frac{1-2s}{y} \frac{\partial u}{\partial y}(x,y)+\frac{\partial^2 u}{\partial y^2}(x,y)=0 \text{ for }x\in\mathbb{R}^d, y>0, \\ u(x,0)=f(x) \text{ for }x\in\mathbb{R}^d. \] In particular, we show that with a logarithmic scaling one can capture the failure of analyticity of these extensions in the limiting cases $s=k \in \mathbb{N}$.

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