The birational compatibility conjecture for Enriques moduli maps

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Let MEn(2)ndeg\mathcal{M}_{{\text{En}}}(2)^{{\text{ndeg}}} be the moduli space of non-degenerate degree-two Enriques surfaces, let X4\mathcal{X}_4 be the moduli space of pointed genus-44 curves, and let Ψ1\Psi_1, Ψ2\Psi_2, and Φ1\Phi_1 be the rational maps described above. Let Υ\Upsilon be the birational isomorphism from the displayed birational identification. Birational compatibility conjecture.

Υ∘Φ1=Ψ2∘Ψ1.\Upsilon\circ\Phi_1=\Psi_2\circ\Psi_1.

The proposed equality identifies the composite construction through pointed genus-44 curves with the map obtained from the Enriques moduli space. The excerpt motivates it by comparing the degrees, but gives no evidence that it has been proved or disproved.

References

Primary source

Igor Dolgachev and Shigeyuki Kondo, “The rationality of the moduli spaces of Coble surfaces and of nodal Enriques surfaces”, arXiv:1201.6093 (2012).

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