Commutators of Hilbert transforms along parabolic and monomial curves are bounded when the symbol lies in a curve-adapted BMO space, and a new testing BMO space gives a partial converse.
Recall that for a parabolic cube Q with dimensions ℓ(Q) ×ℓ(Q)2, we have defined a set EQ by EQ = {x −γ(t) : x ∈Q, 9ℓ(Q) ≤t ≤ 10ℓ(Q)}
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Commutators of Hilbert transforms along monomial curves
Commutators of Hilbert transforms along parabolic and monomial curves are bounded when the symbol lies in a curve-adapted BMO space, and a new testing BMO space gives a partial converse.