Orbifold fundamental group finiteness conjecture for slope rationally connected pairs

From papers

Let (X,D)(X,D) be a smooth connected orbifold pair as above, with DD integral, and let π1(X,D)\pi_1(X,D) and π1alg(X,D)\pi_1^{\mathrm{alg}}(X,D) denote its topological and algebraic orbifold fundamental groups. Write D(+)D(+\infty) for the union of components of DD having multiplicity ++\infty.

Orbifold fundamental group conjecture. The group π1(X,D)\pi_1(X,D) is almost abelian, finite if (X,D)(X,D) is klt, and trivial if (X,D)(X,D) is purely logarithmic or if h0(X,Ω1(X,Log(D1)))=0h^0(X,\Omega^1(X,\operatorname{Log}(D_1)))=0; the same assertions hold for π1alg(X,D)\pi_1^{\mathrm{alg}}(X,D).

The claim is presented as a consequence of the preceding special-orbifold fundamental-group conjecture, since slope rationally connected orbifold pairs are special. Its resolution status is not given in the supplied text.

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Sources & referencesView supporting material

Primary source

Frederic Campana, “Orbifold slope-rational connectedness”, arXiv:1607.07829 (2017).

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