Boundedness conjecture for minimal dlt centers

Let cc and NN be positive integers. A minimal dlt center of a log Calabi–Yau pair is a minimal log canonical center on a dlt modification of that pair. Boundedness conjecture for minimal dlt centers. There exists a birationally bounded family Mc,N\mathcal{M}_{c,N} of algebraic varieties such that, whenever XX is a Fano type variety of coregularity cc and (X,B)(X,B) is an NN-complement of XX computing the coregularity, the minimal dlt centers of (X,B)(X,B) belong to Mc,N\mathcal{M}_{c,N}.

This conjecture would bound the birational types of the minimal centers that are invisible in the dual complex alone. Their birational class is well-defined because any two minimal dlt centers of the same dimension are P1\mathbb{P}^1-linked; the proposed boundedness remains open.

Sources & referencesView supporting material

Primary source

Joaquín Moraga, “Coregularity of Fano varieties”, arXiv:2206.10834 (2022).

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