The Linear Bound for the Natural Weighted Resolution of the Haar Shift
Abstract
The Hilbert transform has a linear bound in the $A_{2}$ characteristic on
weighted $L^{2}$, \begin{equation*} \left\Vert H\right\Vert
_{L^{2}(w)\rightarrow L^{2}(w)}\lesssim \left[ w \right] _{A_{2}},
\end{equation*} and we extend this linear bound to the nine constituent
operators in the natural weighted resolution of the conjugation
$M_{w^{\frac{1}{2}}}\mathcal{S }M_{w^{-\frac{1}{2}}}$ induced by the canonical
decomposition of a multiplier into paraproducts:% \begin{equation*}
M_{f}=P_{f}^{-}+P_{f}^{0}+P_{f}^{+}. \end{equation*} The main tools used are
composition of paraproducts, a product formula for Haar coefficients, the
Carleson Embedding Theorem, and the linear bound for the square function.