The asymptotic gonality-point equality conjecture for binary curves

Let N2(g,γ)N_2(g,\gamma) denote the maximum number of \b5F2\b5\mathbb{F}_2-rational points on a curve of genus gg and gonality γ\gamma. For a curve over F2\mathbb{F}_2 with a degree-γ\gamma morphism to P1\mathbb{P}^1, one has #C(F2)3γ\#C(\mathbb{F}_2)\leq 3\gamma.

Gonality-point equality conjecture. Fix γ2\gamma\geq 2. For gg sufficiently large,

N2(g,γ)=3γ.N_2(g,\gamma)=3\gamma.

The conjecture asserts that, after the low-genus obstructions disappear, the elementary gonality-point upper bound is attained. The supplied text does not indicate whether this has been resolved.

Sources & referencesView supporting material

Primary source

Xander Faber and Jon Grantham, “Binary Curves of small fixed genus and gonality with many rational points”, arXiv:2005.07054 (2022).

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