The authors' bump conjecture for two-weight bilinear forms

Let (w,σ)(w,\sigma) be a pair of weights, set λQ=Q\lambda_Q=|Q| and p=qp=q, and let N\mathcal N be the best constant in the estimate denoted by (eq:norm) in the source. Let AA and BB be Young functions satisfying

1/2A(t)tpdtt<,1/2B(t)tpdtt<.\int_{1/2}^{\infty}\frac{A(t)}{t^p}\frac{dt}{t}<\infty, \qquad \int_{1/2}^{\infty}\frac{B(t)}{t^{p'}}\frac{dt}{t}<\infty.

For the Luxembourg norm, define

fA,Q:=infλ>0:A(f/λ)Q1.\langle f\rangle_{A,Q}:=\inf\\{\lambda>0:\langle A(f/\lambda)\rangle_Q\le 1\\}.

Using the source's weights u,vu,v and parameters q0,p0,r,rq_0,p_0,r,r', define

[u,v]A,q0,p,r=supQvQ1p1q0uQ(1p1q0)(r1)uQ1pu1pA,Q,[u,v]_{A,q_0,p,r}=\sup_Q\langle v\rangle_Q^{\frac1p-\frac1{q_0}}\langle u\rangle_Q^{(\frac1p-\frac1{q_0})(r-1)}\frac{\langle u\rangle_Q^{\frac1p}}{\langle u^{\frac1p}\rangle_{A,Q}}, [v,u]B,p0,p,r=supQuQ1p1p0vQ(1p1p0)(r1)vQ1pv1pB,Q.[v,u]_{B,p_0',p',r'}=\sup_Q\langle u\rangle_Q^{\frac1{p'}-\frac1{p_0'}}\langle v\rangle_Q^{(\frac1{p'}-\frac1{p_0'})(r'-1)}\frac{\langle v\rangle_Q^{\frac1{p'}}}{\langle v^{\frac1{p'}}\rangle_{B,Q}}.

Bump conjecture. There is a constant C>0C>0, independent of ww and σ\sigma, such that

NC([u,v]A,q0,p,r+[v,u]B,p0,p,r).\mathcal N\le C\left([u,v]_{A,q_0,p,r}+[v,u]_{B,p_0',p',r'}\right).

The paper proposes this estimate as a conjecture and states that it implies the one-supremum conjecture with AA_\infty replaced by AexpA_\infty^{\mathrm{exp}} and the separated bump conjecture; no resolution is given.

Sources & referencesView supporting material

Primary source

Kangwei Li, “Two weight inequalities for bilinear forms”, arXiv:1511.07250 (2016).

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