Preprint
Oct 2026
The Fourier restriction problem for biradial functions
We determine the exact strong-type Fourier restriction range for the unit sphere $\mathbb{S}^{d-1}$ on the class of $O(d-k)\times O(k)$-invariant functions, for every $d\geq4$ and $2\leq k\leq d-2$. This includes the critical estimates beyond the biradial Stein--Tomas endpoint left open by Mandel and Oliveira e Silva....
Shinya Kinoshita, Juyoung Lee, D. O. E. Silva et al.
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