Bounded complement approximation conjecture for delta invariants

Let (X,Δ)(X,\Delta) be a log Fano pair, meaning that (X,Δ)(X,\Delta) is log Fano, and suppose that δ(X,Δ)1\delta(X,\Delta)\leq 1. Let AX,Δ(E)A_{X,\Delta}(E) denote the log discrepancy of a prime divisor EE over XX, SX,Δ(E)S_{X,\Delta}(E) its expected vanishing order, and let an NN-complement of plt type (X,Δi+)(X,\Delta_i^+) be a complement of plt type with complement index NN. An lc place of (X,Δi+)(X,\Delta_i^+) is a divisor defining a log canonical place of that pair.

Bounded complement approximation conjecture. There is a natural number NN depending only on (X,Δ)(X,\Delta) and a sequence of prime divisors {Ei}\{E_i\} over XX such that

δ(X,Δ)=limiAX,Δ(Ei)SX,Δ(Ei),\delta(X,\Delta)=\lim_i\frac{A_{X,\Delta}(E_i)}{S_{X,\Delta}(E_i)},

and, for each EiE_i, one can find an NN-complement of plt type (X,Δi+)(X,\Delta_i^+) such that EiE_i is an lc place of (X,Δi+)(X,\Delta_i^+).

The preceding theorem establishes the analogous statement without requiring a bounded complement index. This conjecture asks for a single index NN, depending only on the fixed pair, that works for every divisor in the approximating sequence.

Sources & referencesView supporting material

Primary source

Chuyu Zhou, “Approximating delta invariants in the sense of complements of plt type”, arXiv:2008.10867 (2021).

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