Bilinear restriction range conjecture

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Let n≥2n\geq2, let Q=[−1,1]n−1Q=[-1,1]^{n-1}, and let Φ\Phi be an elliptic phase. For O(1)O(1)-separated subcubes, write R∗(p×p→q)R^*(p\times p\to q) for the bilinear adjoint restriction estimate

∥Re⁡∗f Re⁡∗g∥q<∼∥f∥p∥g∥p.\|\operatorname{Re}^*f\,\operatorname{Re}^*g\|_q<_\sim\|f\|_p\|g\|_p.

Bilinear restriction range conjecture. If n≥2n\geq2, then R∗(p×p→q)R^*(p\times p\to q) holds whenever

q≥nn−1,q\geq\frac{n}{n-1}, n+22q+np≤n,\frac{n+2}{2q}+\frac{n}{p}\leq n, n+22q+n−2p≤n−1.\frac{n+2}{2q}+\frac{n-2}{p}\leq n-1.

By the theorem in the source, this conjecture is verified for q≥2q\geq2 (and hence for n=2n=2), while the general range remains open.

References

Primary source

Terence Tao, Ana Vargas and Luis Vega, “A bilinear approach to the restriction and Kakeya conjectures”, arXiv:math/9807163 (1998).

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