Faithful Galois action on components of moduli of minimal surfaces

Let ϕGal(Q/Q)\phi \in \operatorname{Gal}(\overline{\mathbb{Q}}/\mathbb{Q}) be different from the identity and from complex conjugation. Let SS be a minimal surface of general type, and let

M:=x,y1Mx,y\mathfrak M:= \bigcup_{x,y \geq 1} \mathfrak M_{x,y}

be the coarse moduli space of minimal surfaces of general type.

Faithful-action conjecture. There is a minimal surface of general type SS such that SS and its conjugate SϕS^{\phi} have non-isomorphic fundamental groups. In particular, SS and SϕS^{\phi} are not homeomorphic; hence Gal(Q/Q)\operatorname{Gal}(\overline{\mathbb{Q}}/\mathbb{Q}) acts faithfully on the set of connected components of M\mathfrak M.

This would turn the known phenomenon of Galois-conjugate surfaces with different fundamental groups into a faithful action on moduli components. The supplied text describes this as work in progress, and gives no resolution of the assertion.

Sources & referencesView supporting material

Primary source

Fabrizio Catanese, “Algebraic Surfaces and their Moduli Spaces: Real, Differentiable and Symplectic Structures”, arXiv:0812.4318 (2008).

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