Debarre's ampleness conjecture for generic complete intersections

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Let N⩾2N\geqslant 2 be an integer and let cc satisfy N/2⩽c<NN/2\leqslant c<N. For positive integers d1,…,dcd_1,\dots,d_c, choose generic hypersurfaces

Hi⊂PCN(i=1,…,c)H_i\subset\mathbb{P}_{\mathbb C}^N\qquad (i=1,\dots,c)

with deg⁡Hi=di\deg H_i=d_i, and set

X:=H1∩⋯∩Hc.X:=H_1\cap\cdots\cap H_c.

Debarre's ampleness conjecture. There is a positive lower bound d≫1d\gg1, depending on NN and cc, such that whenever d1,…,dc⩾dd_1,\dots,d_c\geqslant d, the cotangent bundle ΩX\Omega_X is ample.

This conjecture extends Debarre's result for complete intersections in abelian varieties and concerns the expected positivity of cotangent bundles of sufficiently high-degree generic complete intersections in projective space. The paper presents a proof in the stated range, but the supplied parser status gives no explicit resolution evidence.

References

Primary source

Song-Yan Xie, “On the ampleness of the cotangent bundles of complete intersections”, arXiv:1510.06323 (2016).

Additional references

2 papers in this index state this conjecture (2009–2015). The statement above is taken from the most recent of them; the others are arXiv:0902.3741.

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