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Incidences and pairs of dot products
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abstract
Let $\mathbb{F}$ be a field, let $P \subseteq \mathbb{F}^d$ be a finite set of points, and let $\alpha,\beta \in \mathbb{F} \setminus \{0\}$. We study the quantity \[|\Pi_{\alpha, \beta}| = \{(p,q,r) \in P \times P \times P \mid p \cdot q = \alpha, p \cdot r = \beta \}.\] We observe a connection between the question of placing an upper bound on $|\Pi_{\alpha,\beta}|$ and a well-studied question on the number of incidences betwen points and hyperplanes, and use this connection to prove new and strengthened upper bounds on $|\Pi_{\alpha,\beta}|$ in a variety of settings.
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Cited by 1 Pith paper
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A Structural Condition on Point Sets with Few Distinct Dot Products
Any point set in the plane with o(n^{3/4}) distinct dot products must contain a line through the origin holding n^{1/2} points whose consecutive distance ratios cluster near 1.
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