Main asymptotic conjecture for spherical two-distance sets

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Fix −1≤β<0≤α<1-1\le\beta<0\le\alpha<1. For a spherical two-distance set in Rd\mathbb R^d with inner products in {α,β}\{\alpha,\beta\}, let Nα,β(d)N_{\alpha,\beta}(d) be the maximum possible size. For λ=(1−α)/(α−β)\lambda=(1-\alpha)/(\alpha-\beta) and p=⌊−α/β⌋+1p=\lfloor-\alpha/\beta\rfloor+1, let kp(λ)k_p(\lambda) denote the relevant signed-graph eigenvalue multiplicity parameter. Main conjecture.

lim⁡d→∞Nα,β(d)d={kp(λ)kp(λ)−1,if kp(λ)<∞,1,otherwise.\lim_{d\to\infty}\frac{N_{\alpha,\beta}(d)}{d}=\begin{cases}\displaystyle\frac{k_p(\lambda)}{k_p(\lambda)-1},&\text{if }k_p(\lambda)<\infty,\\1,&\text{otherwise}.\end{cases}

The conjecture is presented as the sharp form of the preceding lower bounds. The paper states that all cases are proved in its main theorem, but the supplied text does not identify the precise cases or establish the full conjecture, so its overall resolution should be checked against that theorem.

References

Primary source

Zilin Jiang, Jonathan Tidor, Yuan Yao, Shengtong Zhang and Yufei Zhao, “Spherical two-distance sets and eigenvalues of signed graphs”, arXiv:2006.06633 (2022).

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