Bilinear restriction range conjecture

From papers

Let n2n\geq2, let Q=[1,1]n1Q=[-1,1]^{n-1}, and let Φ\Phi be an elliptic phase. For O(1)O(1)-separated subcubes, write R(p×pq)R^*(p\times p\to q) for the bilinear adjoint restriction estimate

RefRegq<fpgp.\|\operatorname{Re}^*f\,\operatorname{Re}^*g\|_q<_\sim\|f\|_p\|g\|_p.

Bilinear restriction range conjecture. If n2n\geq2, then R(p×pq)R^*(p\times p\to q) holds whenever

qnn1,q\geq\frac{n}{n-1}, n+22q+npn,\frac{n+2}{2q}+\frac{n}{p}\leq n, n+22q+n2pn1.\frac{n+2}{2q}+\frac{n-2}{p}\leq n-1.

By the theorem in the source, this conjecture is verified for q2q\geq2 (and hence for n=2n=2), while the general range remains open.

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Sources & referencesView supporting material

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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