end point estimates for the bilinear circular averaging operator
We prove that the bilinear circular averaging operator is bounded from $L^1(\mathbb{R}) \times L^1(\mathbb{R})$ to $L^{1/2,\infty}(\mathbb{R})$. The corresponding strong estimate fails, even when the inputs are nonnegative, smooth, and compactly supported. We also construct nonnegative $f,g \in L^1(\mathbb{R})$ for which the average does not belong to $L^{1/2}(\mathbb{R})$. The weak estimate is proved by a dyadic decomposition of the inputs and a summation over interval pairs near each quadratic fold.
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