Two weight inequalities for bilinear forms

Abstract

Let $1\le p_0<p,q<q_0\le \infty$. Given a pair of weights $(w,\sigma )$ and a sparse family $\mathcal{S}$, we study the two weight inequality for the following bi-sublinear form \[ B(f, g)= \sum_{Q\in\mathcal S}\langle |f|^{p_0}\rangle_Q^{\frac 1{p_0}} \langle|g|^{q_0'}\rangle_Q^{\frac 1{q_0'}}λ_Q\le \mathcal N\|f\|_{L^{p}(w)}\|g\|_{L^{q'}(σ)}. \] When ${\lambda }_Q=|Q|$ and $p=q$, Bernicot, Frey and Petermichl showed that $B(f,g)$ dominates $⟨Tf,g⟩$ for a large class of singular non-kernel operators. We give a characterization for the above inequality and then obtain the mixed $A_p$-$A_{\infty }$ estimates and the corresponding entropy bounds when ${\lambda }_Q=|Q|$ and $p=q$. We also proposed a new conjecture which implies both the one supremum conjecture and the separated bump conjecture.

16 pages, v2. minor corrections, accepted for publication in Collectanea Mathematica